I've found edits made using Help pane (and possibly other Growth-made products) can bypass sysop-issued blocks, see https://cs.wikipedia.org/w/index.php?title=Wikipedie:Pot%C5%99ebuji_pomoc&diff=prev&oldid=17175968, made by Daniel Hut. This user was blocked on 16 April 12:33 CEST by sysop OJJ. This question was posted on 26 April, which is _after_ this block was issued.
I don't think users should be able to use this module when blocked. Theoretically, we can amend the block interface to allow sysops to block all edits but questions, or simply ban edits by this interface.