This empty patch https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ProofreadPage/+/1212546 is not passing CI.
Current assumption: there is now a conditional load of VE (via https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ProofreadPage/+/1193456), and I'm assuming that ParserFunctions would come as a dependency somewhere of that (probably via Cite), and if it's not loaded, the corresponding parserTests that use this extension are also broken.
MW_ZUUL_RECURSE is true, and EXT_DEPENDENCIES is
mediawiki/extensions/BetaFeatures mediawiki/extensions/Cite mediawiki/extensions/ConfirmEdit mediawiki/extensions/DiscussionTools mediawiki/extensions/FlaggedRevs mediawiki/extensions/LabeledSectionTransclusion mediawiki/extensions/Linter mediawiki/extensions/Scribunto mediawiki/extensions/TemplateData mediawiki/extensions/VisualEditor