The ProofreadPage table seems to be on all wikis, but it should only be on the wikis listed below.
Please drop it from other wikis!
'wmgUseProofreadPage' => [ 'default' => false, 'wikisource' => true, 'sourceswiki' => true, // FIXME: should be a part of wikisource (see T91534) 'test2wiki' => true, 'frrwiki' => true, // T40023 ],
Note wikisource is not the name of a wiki, but of a list of wikis: https://noc.wikimedia.org/conf/highlight.php?file=wikisource.dblist