From the text: We present here a revised version of the appendices of our paper [ibid. 2019, No. 5, Article ID 053206, 34 p. (2019; Zbl 1457.82251)]. Some minor corrections are introduced and a new simplified argument to obtain the critical value of \(r_c\), the control parameter for the transition, is presented. The overall scenario and the description of the transition mechanism depicted in [loc. cit.] remains completely untouched, the only relevant difference being the value of \(r_c\) fixed to \(r_c=2^{1/3}=1.25992\dots\) rather than \(r_c=1.3805\dots\). This difference also implies a small quantitative changes in figures 2 and 4; a new version of both figures is reported here. A couple of other typos discovered in the paper are pointed out and the correct version of the expressions are reported.