When I tried to activate the extension with the new mediawiki 1.35 I got an Error on each Category Page.
Blame is to be attributed to ArticleToCategory2.hooks.php again.
There is a typo in line 77 right after // MW 1.33+
It needs to be
!$permManager->quickUserCan
instead of:
!$permManagare->quickUserCan
Cheers