When trying to create an account on ruwiktionary, I got the following message:
Login error
<<p>The user name "Jdforrester (WMF)" has been banned from creation. It matches the following blacklist entry: <code>.*\(.+\)$ <newaccountonly> # Участник:%username%_(сексуалист)</code> </p>>
Looking at [[MediaWiki:Titleblacklist-forbidden-new-account]] it looks fine, so presumably either the <code> is triggering something odd, or Titleblacklist is calling it wrongly?
Version: master
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=44718