Footnotes block completely breaks Block Editor causing page to be uneditable

[maddisondesigns]

Description

I added a Footnotes block to my page and added a couple of Footnotes.
I then deleted the Footnotes block as I wanted to see if I was still able to add Footnotes (using the More option on the Block Toolbar). To my surprise, it automatically re-added the Footnotes block to the bottom of my page.
I then clicked the 'back' icon within the Footnotes block, next to the newly inserted (blank) footnote, went back to where the Footnote was inserted and removed it.

The Block Editor then completely broke and I am now unable to edit this page. If I try to edit the page, I'm shown the standard WordPress Critical Error message. If I try to view the page in the browser, no content displays. With Debug turned on, I'm shown a Fatal Error. (see below)

If I try to edit the page I get this Fatal Error:

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks/footnotes.php:37 Stack trace: #0 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/class-wp-block.php(258): render_block_core_footnotes(Array, '', Object(WP_Block)) #1 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks.php(1133): WP_Block->render() #2 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks.php(1171): render_block(Array) #3 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/class-wp-hook.php(310): do_blocks('<!-- wp:heading...') #4 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/plugin.php(205): WP_Hook->apply_filters('<!-- wp:heading...', Array) #5 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(1864): apply_filters('the_content', '<!-- wp:heading...') #6 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php(569): WP_REST_Posts_Controller->prepare_item_for_response(Object(WP_Post), Object(WP_REST_Request)) #7 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api/class-wp-rest-server.php(1188): WP_REST_Posts_Controller->get_item(Object(WP_REST_Request)) #8 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api/class-wp-rest-server.php(1035): WP_REST_Server->respond_to_request(Object(WP_REST_Request), '/wp/v2/pages/(?...', Array, NULL) #9 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api.php(545): WP_REST_Server->dispatch(Object(WP_REST_Request)) #10 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/rest-api.php(2911): rest_do_request(Object(WP_REST_Request)) #11 [internal function]: rest_preload_api_request(Array, '/wp/v2/pages/29...') #12 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/block-editor.php(743): array_reduce(Array, 'rest_preload_ap...', Array) #13 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-admin/edit-form-blocks.php(77): block_editor_rest_api_preload(Array, Object(WP_Block_Editor_Context)) #14 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-admin/post.php(187): require('/Users/anthonyh...') #15 {main} thrown in /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks/footnotes.php on line 37

With debug turned on, I'm shown this Fatal Error when trying to view the page in the browser: (it's worth noting that I didn't save the page after removing the Footnotes Block, so the auto-save has completely stopped the previously saved page content from showing)

Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks/footnotes.php:37 Stack trace: #0 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/class-wp-block.php(258): render_block_core_footnotes(Array, '', Object(WP_Block)) #1 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks.php(1133): WP_Block->render() #2 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks.php(1171): render_block(Array) #3 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/class-wp-hook.php(310): do_blocks('<!-- wp:heading...') #4 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/plugin.php(205): WP_Hook->apply_filters('<!-- wp:heading...', Array) #5 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/post-template.php(256): apply_filters('the_content', '<!-- wp:heading...') #6 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-content/themes/twentytwentyone/template-parts/content/content-page.php(29): the_content() #7 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/template.php(787): require('/Users/anthonyh...') #8 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/template.php(720): load_template('/Users/anthonyh...', false, Array) #9 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/general-template.php(206): locate_template(Array, true, false, Array) #10 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-content/themes/twentytwentyone-child/page.php(14): get_template_part('template-parts/...') #11 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/template-loader.php(106): include('/Users/anthonyh...') #12 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-blog-header.php(19): require_once('/Users/anthonyh...') #13 /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/index.php(17): require('/Users/anthonyh...') #14 {main} thrown in /Users/anthonyhortin/Documents/sites/your-wordpress-site.com/wp-includes/blocks/footnotes.php on line 37

Looking in the database, this is the content from the last saved page (2023-08-27 20:25:08)

<!-- wp:heading -->
<h2 class="wp-block-heading" id="classic-block">Classic Block</h2>
<!-- /wp:heading -->

<p>Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam.</p>
<p>The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.</p>
<p>Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.</p>
<p>The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.</p>
<p>It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.</p>

<!-- wp:heading -->
<h2 class="wp-block-heading" id="code-block">Code Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:code -->
<pre class="wp-block-code"><code>&lt;?php
/**
 * Enqueue scripts and styles.
 * Our sample Social Icons are using Font Awesome to display the icons so we need to include the FA CSS
 *
 * @return void
 */
if ( ! function_exists( 'skyrocket_scripts_styles' ) ) {
	function skyrocket_scripts_styles() {
		// Register and enqueue our icon font
		// We're using the awesome Font Awesome icon font. http://fortawesome.github.io/Font-Awesome
		wp_register_style( 'fontawesome', trailingslashit( get_template_directory_uri() ) . 'css/font-awesome.min.css' , array(), '4.7', 'all' );
		wp_enqueue_style( 'fontawesome' );
	}
}
add_action( 'wp_enqueue_scripts', 'skyrocket_scripts_styles' );</code></pre>
<!-- /wp:code -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-block">Details Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:details {"summary":""} -->
<details class="wp-block-details"><summary>Details</summary><!-- wp:paragraph {"placeholder":"Type / to add a hidden block"} -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque ut consectetur erat. Sed mauris tellus, faucibus eu nisl sit amet, pellentesque tempor urna.</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>Nam eget leo ut justo consequat vulputate ac sit amet odio. Nullam turpis lorem, consequat sed pretium non, gravida at augue.</p>
<!-- /wp:paragraph --></details>
<!-- /wp:details -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-block">Footnotes Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:footnotes /-->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-block">Heading Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:heading {"level":1} -->
<h1 class="wp-block-heading" id="heading-1">Heading 1</h1>
<!-- /wp:heading -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-2">Heading 2</h2>
<!-- /wp:heading -->

<!-- wp:heading {"level":3} -->
<h3 class="wp-block-heading" id="heading-3">Heading 3</h3>
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<!-- wp:heading {"level":4} -->
<h4 class="wp-block-heading" id="heading-4">Heading 4</h4>
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<h5 class="wp-block-heading" id="heading-5">Heading 5</h5>
<!-- /wp:heading -->

<!-- wp:heading {"level":6} -->
<h6 class="wp-block-heading" id="heading-6">Heading 6</h6>
<!-- /wp:heading -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="list-block">List Block</h2>
<!-- /wp:heading -->

<!-- wp:list -->
<ul><!-- wp:list-item -->
<li>List Item 1</li>
<!-- /wp:list-item -->

<!-- wp:list-item -->
<li>List Item 2</li>
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<li>List Item 3</li>
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<li>List Item 4</li>
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<!-- wp:list-item -->
<li>List Item 5</li>
<!-- /wp:list-item --></ul>
<!-- /wp:list -->

<!-- wp:list {"ordered":true} -->
<ol><!-- wp:list-item -->
<li>Numbered List Item 1</li>
<!-- /wp:list-item -->

<!-- wp:list-item -->
<li>Numbered List Item 2</li>
<!-- /wp:list-item -->

<!-- wp:list-item -->
<li>Numbered List Item 3</li>
<!-- /wp:list-item -->

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<li>Numbered List Item 4</li>
<!-- /wp:list-item -->

<!-- wp:list-item -->
<li>Numbered List Item 5</li>
<!-- /wp:list-item --></ol>
<!-- /wp:list -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="paragraph-block">Paragraph Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph {"style":{"color":{"background":"#2b4561"}},"textColor":"white"} -->
<p class="has-white-color has-text-color has-background" style="background-color:#2b4561">Look again at that dot. That’s here. That’s home<sup data-fn="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" class="fn"><a href="#cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" id="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7-link">1</a></sup>. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives.</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there–on a mote of dust suspended in a sunbeam.</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph {"backgroundColor":"dark-gray","textColor":"white"} -->
<p class="has-white-color has-dark-gray-background-color has-text-color has-background">A Paragraph block with background and text colours. Lorem ipsum dolor<sup data-fn="c5937388-3f5c-48c9-9bd3-da38d205123e" class="fn"><a href="#c5937388-3f5c-48c9-9bd3-da38d205123e" id="c5937388-3f5c-48c9-9bd3-da38d205123e-link">2</a></sup> sit amet, consectetur adipiscing elit. Proin sed erat at dolor vulputate pretium. Praesent mauris est, mollis sed dapibus at, pretium ut orci. Morbi elit felis, porttitor vel mauris nec, venenatis facilisis magna. Nunc pulvinar euismod maximus. Maecenas in ullamcorper sem. Ut tempor neque eu erat venenatis mollis. Proin consequat turpis ac metus gravida vulputate. Sed dui sem, ultricies ac sem at, ultricies vestibulum nibh. Donec eu massa sit amet ex maximus fringilla. Donec fermentum volutpat erat eget rutrum. Fusce varius, tellus vitae pretium placerat, felis ligula viverra magna, sed porta turpis diam id nibh. Praesent sit amet augue ac ligula elementum ullamcorper eget non sem. Curabitur eu metus lacus. Duis semper elementum magna, vel pharetra arcu fringilla vel.</p>
<!-- /wp:paragraph -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="preformatted-block">Preformatted Block</h2>
<!-- /wp:heading -->

<!-- wp:preformatted -->
<pre class="wp-block-preformatted">Vivamus sagittis lacus vel augue laoreet rutrum faucibus. Praeterea iter est quasdam res quas ex communi. Ullamco laboris nisi ut aliquid ex ea commodi consequat. Nihilne te nocturnum praesidium Palati, nihil urbis vigiliae.</pre>
<!-- /wp:preformatted -->

<!-- wp:preformatted -->
<pre class="wp-block-preformatted">Vivamus sagittis lacus vel augue laoreet rutrum faucibus. Praeterea iter est quasdam res quas ex communi. Ullamco laboris nisi ut aliquid ex ea commodi consequat. Nihilne te nocturnum praesidium Palati, nihil urbis vigiliae.</pre>
<!-- /wp:preformatted -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="pullquote-block">Pullquote Block</h2>
<!-- /wp:heading -->

<!-- wp:pullquote {"className":"alignnone is-style-default"} -->
<figure class="wp-block-pullquote alignnone is-style-default"><blockquote><p>Look again at that dot. That's here. That's home. That's us.</p><cite>Carl Sagan - Pale Blue Dot: A Vision of the Human Future in Space</cite></blockquote></figure>
<!-- /wp:pullquote -->

<!-- wp:pullquote {"style":{"border":{"radius":"5px"}},"className":"alignnone is-style-default"} -->
<figure class="wp-block-pullquote alignnone is-style-default" style="border-radius:5px"><blockquote><p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p><cite>Tony Stark - Iron Man</cite></blockquote></figure>
<!-- /wp:pullquote -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="quote-block">Quote Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin sed erat at dolor vulputate pretium. </p>
<!-- /wp:paragraph -->

<!-- wp:quote {"className":"is-style-default"} -->
<blockquote class="wp-block-quote is-style-default"><!-- wp:paragraph -->
<p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p>
<!-- /wp:paragraph --><cite>Tony Stark - Iron Man</cite></blockquote>
<!-- /wp:quote -->

<!-- wp:quote {"align":"center","className":"is-style-large"} -->
<blockquote class="wp-block-quote has-text-align-center is-style-large"><!-- wp:paragraph -->
<p>When the mob and the press and the whole world tell you to move, your job is to plant yourself like a tree by the river of truth, and tell the whole world “No, You Move.”</p>
<!-- /wp:paragraph --><cite>Captain America</cite></blockquote>
<!-- /wp:quote -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="table-block">Table Block</h2>
<!-- /wp:heading -->

<!-- wp:table {"className":"is-style-stripes"} -->
<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 1 </td><td>Qtr 2</td></tr><tr><td>2016</td><td>$16,000</td><td>$14,000</td></tr><tr><td>2017</td><td>$24,015</td><td>$16,035</td></tr><tr><td>2018</td><td>$23,500</td><td>$19,075</td></tr></tbody></table></figure>
<!-- /wp:table -->

<!-- wp:table {"className":"is-style-stripes"} -->
<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 3 </td><td>Qtr 4</td></tr><tr><td>2016</td><td>$8,000</td><td>$13,790</td></tr><tr><td>2017</td><td>$15,475</td><td>$34,250</td></tr><tr><td>2018</td><td>$27,100</td><td>$13,000</td></tr></tbody></table></figure>
<!-- /wp:table -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="verse-block">Verse Block</h2>
<!-- /wp:heading -->

<!-- wp:verse -->
<pre class="wp-block-verse">The night is come, but not too soon;
And sinking silently,
All silently, the little moon
Drops down behind the sky.</pre>
<!-- /wp:verse -->

<!-- wp:verse -->
<pre class="wp-block-verse">There is no light in earth or heaven
But the cold light of stars;
And the first watch of night is given
To the red planet Mars.</pre>
<!-- /wp:verse -->

<!-- wp:spacer -->
<div style="height:100px" aria-hidden="true" class="wp-block-spacer"></div>
<!-- /wp:spacer -->

There also appears to be two saved revisions dated after the above page. This is the first one (2023-08-27 20:25:08):

<!-- wp:heading -->
<h2 class="wp-block-heading" id="classic-block">Classic Block</h2>
<!-- /wp:heading -->

<p>Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam.</p>
<p>The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.</p>
<p>Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.</p>
<p>The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.</p>
<p>It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.</p>

<!-- wp:heading -->
<h2 class="wp-block-heading" id="code-block">Code Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:code -->
<pre class="wp-block-code"><code>&lt;?php
/**
 * Enqueue scripts and styles.
 * Our sample Social Icons are using Font Awesome to display the icons so we need to include the FA CSS
 *
 * @return void
 */
if ( ! function_exists( 'skyrocket_scripts_styles' ) ) {
	function skyrocket_scripts_styles() {
		// Register and enqueue our icon font
		// We're using the awesome Font Awesome icon font. http://fortawesome.github.io/Font-Awesome
		wp_register_style( 'fontawesome', trailingslashit( get_template_directory_uri() ) . 'css/font-awesome.min.css' , array(), '4.7', 'all' );
		wp_enqueue_style( 'fontawesome' );
	}
}
add_action( 'wp_enqueue_scripts', 'skyrocket_scripts_styles' );</code></pre>
<!-- /wp:code -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-block">Details Block</h2>
<!-- /wp:heading -->

<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:details {"summary":""} -->
<details class="wp-block-details"><summary>Details</summary><!-- wp:paragraph {"placeholder":"Type / to add a hidden block"} -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque ut consectetur erat. Sed mauris tellus, faucibus eu nisl sit amet, pellentesque tempor urna.</p>
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>Nam eget leo ut justo consequat vulputate ac sit amet odio. Nullam turpis lorem, consequat sed pretium non, gravida at augue.</p>
<!-- /wp:paragraph --></details>
<!-- /wp:details -->

<!-- wp:heading -->
<h2 class="wp-block-heading" id="heading-block">Footnotes Block</h2>
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<!-- wp:paragraph -->
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<!-- /wp:paragraph -->

<!-- wp:footnotes /-->

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<h2 class="wp-block-heading" id="heading-block">Heading Block</h2>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
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<h1 class="wp-block-heading" id="heading-1">Heading 1</h1>
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<h4 class="wp-block-heading" id="heading-4">Heading 4</h4>
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<h6 class="wp-block-heading" id="heading-6">Heading 6</h6>
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<h2 class="wp-block-heading" id="list-block">List Block</h2>
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<ul><!-- wp:list-item -->
<li>List Item 1</li>
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<li>List Item 3</li>
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<li>List Item 4</li>
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<li>List Item 5</li>
<!-- /wp:list-item --></ul>
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<ol><!-- wp:list-item -->
<li>Numbered List Item 1</li>
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<p class="has-white-color has-text-color has-background" style="background-color:#2b4561">Look again at that dot. That’s here. That’s home<sup data-fn="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" class="fn"><a href="#cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" id="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7-link">1</a></sup>. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives.</p>
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<p>The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there–on a mote of dust suspended in a sunbeam.</p>
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<p class="has-white-color has-dark-gray-background-color has-text-color has-background">A Paragraph block with background and text colours. Lorem ipsum dolor<sup data-fn="c5937388-3f5c-48c9-9bd3-da38d205123e" class="fn"><a href="#c5937388-3f5c-48c9-9bd3-da38d205123e" id="c5937388-3f5c-48c9-9bd3-da38d205123e-link">2</a></sup> sit amet, consectetur adipiscing elit. Proin sed erat at dolor vulputate pretium. Praesent mauris est, mollis sed dapibus at, pretium ut orci. Morbi elit felis, porttitor vel mauris nec, venenatis facilisis magna. Nunc pulvinar euismod maximus. Maecenas in ullamcorper sem. Ut tempor neque eu erat venenatis mollis. Proin consequat turpis ac metus gravida vulputate. Sed dui sem, ultricies ac sem at, ultricies vestibulum nibh. Donec eu massa sit amet ex maximus fringilla. Donec fermentum volutpat erat eget rutrum. Fusce varius, tellus vitae pretium placerat, felis ligula viverra magna, sed porta turpis diam id nibh. Praesent sit amet augue ac ligula elementum ullamcorper eget non sem. Curabitur eu metus lacus. Duis semper elementum magna, vel pharetra arcu fringilla vel.</p>
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<pre class="wp-block-preformatted">Vivamus sagittis lacus vel augue laoreet rutrum faucibus. Praeterea iter est quasdam res quas ex communi. Ullamco laboris nisi ut aliquid ex ea commodi consequat. Nihilne te nocturnum praesidium Palati, nihil urbis vigiliae.</pre>
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<figure class="wp-block-pullquote alignnone is-style-default"><blockquote><p>Look again at that dot. That's here. That's home. That's us.</p><cite>Carl Sagan - Pale Blue Dot: A Vision of the Human Future in Space</cite></blockquote></figure>
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<figure class="wp-block-pullquote alignnone is-style-default" style="border-radius:5px"><blockquote><p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p><cite>Tony Stark - Iron Man</cite></blockquote></figure>
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<p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p>
<!-- /wp:paragraph --><cite>Tony Stark - Iron Man</cite></blockquote>
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<blockquote class="wp-block-quote has-text-align-center is-style-large"><!-- wp:paragraph -->
<p>When the mob and the press and the whole world tell you to move, your job is to plant yourself like a tree by the river of truth, and tell the whole world “No, You Move.”</p>
<!-- /wp:paragraph --><cite>Captain America</cite></blockquote>
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<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 1 </td><td>Qtr 2</td></tr><tr><td>2016</td><td>$16,000</td><td>$14,000</td></tr><tr><td>2017</td><td>$24,015</td><td>$16,035</td></tr><tr><td>2018</td><td>$23,500</td><td>$19,075</td></tr></tbody></table></figure>
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<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 3 </td><td>Qtr 4</td></tr><tr><td>2016</td><td>$8,000</td><td>$13,790</td></tr><tr><td>2017</td><td>$15,475</td><td>$34,250</td></tr><tr><td>2018</td><td>$27,100</td><td>$13,000</td></tr></tbody></table></figure>
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<pre class="wp-block-verse">The night is come, but not too soon;
And sinking silently,
All silently, the little moon
Drops down behind the sky.</pre>
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<pre class="wp-block-verse">There is no light in earth or heaven
But the cold light of stars;
And the first watch of night is given
To the red planet Mars.</pre>
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This is the second one (2023-08-27 20:32:15):

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<p>Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam.</p>
<p>The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.</p>
<p>Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.</p>
<p>The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.</p>
<p>It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.</p>

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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
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<pre class="wp-block-code"><code>&lt;?php
/**
 * Enqueue scripts and styles.
 * Our sample Social Icons are using Font Awesome to display the icons so we need to include the FA CSS
 *
 * @return void
 */
if ( ! function_exists( 'skyrocket_scripts_styles' ) ) {
	function skyrocket_scripts_styles() {
		// Register and enqueue our icon font
		// We're using the awesome Font Awesome icon font. http://fortawesome.github.io/Font-Awesome
		wp_register_style( 'fontawesome', trailingslashit( get_template_directory_uri() ) . 'css/font-awesome.min.css' , array(), '4.7', 'all' );
		wp_enqueue_style( 'fontawesome' );
	}
}
add_action( 'wp_enqueue_scripts', 'skyrocket_scripts_styles' );</code></pre>
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<p class="has-white-color has-text-color has-background" style="background-color:#2b4561">Look again at that dot. That’s here. That’s home<sup data-fn="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" class="fn"><a href="#cbfd8291-5c89-4d92-a6f2-94d48eeef1b7" id="cbfd8291-5c89-4d92-a6f2-94d48eeef1b7-link">1</a></sup>. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives.</p>
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<p>The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there–on a mote of dust suspended in a sunbeam.</p>
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<p class="has-white-color has-dark-gray-background-color has-text-color has-background">A Paragraph block with background and text colours. Lorem ipsum dolor<sup data-fn="c5937388-3f5c-48c9-9bd3-da38d205123e" class="fn"><a href="#c5937388-3f5c-48c9-9bd3-da38d205123e" id="c5937388-3f5c-48c9-9bd3-da38d205123e-link">2</a></sup> sit amet, consectetur adipiscing elit. Proin sed erat at dolor vulputate pretium. Praesent mauris est, mollis sed dapibus at, pretium ut orci. Morbi elit felis, porttitor vel mauris nec, venenatis facilisis magna. Nunc pulvinar euismod maximus. Maecenas in ullamcorper sem. Ut tempor neque eu erat venenatis mollis. Proin consequat turpis ac metus gravida vulputate. Sed dui sem, ultricies ac sem at, ultricies vestibulum nibh. Donec eu massa sit amet ex maximus fringilla. Donec fermentum volutpat erat eget rutrum. Fusce varius, tellus vitae pretium placerat, felis ligula viverra magna, sed porta turpis diam id nibh. Praesent sit amet augue ac ligula elementum ullamcorper eget non sem. Curabitur eu metus lacus. Duis semper elementum magna, vel pharetra arcu fringilla vel.</p>
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<pre class="wp-block-preformatted">Vivamus sagittis lacus vel augue laoreet rutrum faucibus. Praeterea iter est quasdam res quas ex communi. Ullamco laboris nisi ut aliquid ex ea commodi consequat. Nihilne te nocturnum praesidium Palati, nihil urbis vigiliae.</pre>
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<figure class="wp-block-pullquote alignnone is-style-default"><blockquote><p>Look again at that dot. That's here. That's home. That's us.</p><cite>Carl Sagan - Pale Blue Dot: A Vision of the Human Future in Space</cite></blockquote></figure>
<!-- /wp:pullquote -->

<!-- wp:pullquote {"style":{"border":{"radius":"5px"}},"className":"alignnone is-style-default"} -->
<figure class="wp-block-pullquote alignnone is-style-default" style="border-radius:5px"><blockquote><p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p><cite>Tony Stark - Iron Man</cite></blockquote></figure>
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<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin sed erat at dolor vulputate pretium. </p>
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<blockquote class="wp-block-quote is-style-default"><!-- wp:paragraph -->
<p>Iron Man. That’s kind of catchy. It’s got a nice ring to it. I mean it’s not technically accurate. The suit’s a gold titanium alloy, but it’s kind of provocative, the imagery anyway.</p>
<!-- /wp:paragraph --><cite>Tony Stark - Iron Man</cite></blockquote>
<!-- /wp:quote -->

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<blockquote class="wp-block-quote has-text-align-center is-style-large"><!-- wp:paragraph -->
<p>When the mob and the press and the whole world tell you to move, your job is to plant yourself like a tree by the river of truth, and tell the whole world “No, You Move.”</p>
<!-- /wp:paragraph --><cite>Captain America</cite></blockquote>
<!-- /wp:quote -->

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<h2 class="wp-block-heading" id="table-block">Table Block</h2>
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<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 1 </td><td>Qtr 2</td></tr><tr><td>2016</td><td>$16,000</td><td>$14,000</td></tr><tr><td>2017</td><td>$24,015</td><td>$16,035</td></tr><tr><td>2018</td><td>$23,500</td><td>$19,075</td></tr></tbody></table></figure>
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<figure class="wp-block-table is-style-stripes"><table><tbody><tr><td></td><td>Qtr 3 </td><td>Qtr 4</td></tr><tr><td>2016</td><td>$8,000</td><td>$13,790</td></tr><tr><td>2017</td><td>$15,475</td><td>$34,250</td></tr><tr><td>2018</td><td>$27,100</td><td>$13,000</td></tr></tbody></table></figure>
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<h2 class="wp-block-heading" id="verse-block">Verse Block</h2>
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<pre class="wp-block-verse">The night is come, but not too soon;
And sinking silently,
All silently, the little moon
Drops down behind the sky.</pre>
<!-- /wp:verse -->

<!-- wp:verse -->
<pre class="wp-block-verse">There is no light in earth or heaven
But the cold light of stars;
And the first watch of night is given
To the red planet Mars.</pre>
<!-- /wp:verse -->

<!-- wp:spacer -->
<div style="height:100px" aria-hidden="true" class="wp-block-spacer"></div>
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This page is now completely broken within the Block Editor and I'm not able to edit it. The only way I've been able to get my content back is by copying the content directly from the database, creating a new page, and manually copying the block content back into the page via Code Editor mode.

Step-by-step reproduction instructions

See above

Screenshots, screen recording, code snippet

No response

Environment info

• WP 6.3 (core, no plugin)
• Firefox 116.0.3
• macOS 13.5.1
• Twenty-Twenty One
• No plugins activated

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[Mamaduka]

This was fixed via #53660 and should be part of the next minor release.