MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations. If one sets MediaWiki:Mainpage to Special:MyLanguage/Main Page, visits a log entry on Special:Log, and toggles the "Change visibility of selected log entries" checkbox (or a tags checkbox) next to it, there is a redirection to the main page's action=historysubmit (instead of the desired behavior in which a revision-deletion form appears). References: https://phabricator.wikimedia.org/T205908 https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
Created mediawiki tracking bugs for this issue: Affects: fedora-all [bug 1909232]
External References: https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html