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In the mediawiki/extensions/EventBus code repository, there's a class called EventBusHooks, that has a function, onArticleRevisionVisibilitySet, which likely unintentionally creates new global functions.

In PHP, creating a function inside a class static function actually creates a global function (unlike JavaScript). https://3v4l.org/7tNtb

This should be switched to having private static helper functions instead of creating new global functions.

You are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.