There is discussion at https://en.wikipedia.org/w/index.php?title=Wikipedia:VisualEditor/Feedback&oldid=571087443#nowiki_tags about using the edit filter to block edits adding the <nowiki /> tag in mainspace. However it was pointed out that "the user probably has no way to know what they need to fix in order to resubmit their edit. They can't find the nowiki tag, as it is invisible."
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=49806
https://bugzilla.wikimedia.org/show_bug.cgi?id=49603