TYPO3 Core

This is a follow-up issue to #90238, which was closed due to lack of feedback.

The described behavior is still reproducible, the fieldExplanationText is not rendered for form finisher checkboxes. This is especially the case since #95086 got merged, because this patch removed the template element for field explanation texts. I don't see any arguments for not having such field explanation texts for checkboxes. Therefore, I suggest to treat this as a regression of #95086 and re-add field explanation texts for form finisher checkboxes.

At the moment, the finisher option addHtmlPart of e-mail finishers already provides a field explanation text which is not rendered anymore (at least with TYPO3 v12.4.5 and latest main). For verification, just create a new form, add an e-mail finisher and check out finisher option addHtmlPart.