I've included a code on the MR to integrate the Workflow transitions permission validation during the plugin access check.
igorbarato → changed the visibility of the branch 3159943-elaborate-content-moderation to hidden.
igorbarato → created an issue.
igorbarato → changed the visibility of the branch 3031380-form-widget-for to active.
igorbarato → changed the visibility of the branch 3031380-form-widget-for to hidden.
igorbarato → made their first commit to this issue’s fork.
Wim Leers → credited igorbarato → .
I tested the patch on Drupal 9.5, 10.0, and 10.1 and it's working correctly. Adding screenshots of each version.
Drupal 9.5.x
Drupal 10.0.x
Drupal 10.1.x