UniversalLanguageSelector supports a "mnc" input method, and expects the documentation for that input method to be at https://www.mediawiki.org/wiki/Help:Extension:UniversalLanguageSelector/Input_methods/mnc.

However, "mnc" was added as a language code in 2023. Thus, Translate thinks https://www.mediawiki.org/wiki/Help:Extension:UniversalLanguageSelector/Input_methods/mnc is a translation of the page https://www.mediawiki.org/wiki/Help:Extension:UniversalLanguageSelector/Input_methods into the Manchu language, and had FuzzyBot clobber the input method help: https://www.mediawiki.org/w/index.php?title=Help:Extension:UniversalLanguageSelector/Input_methods/Manchu&diff=prev&oldid=6239755

I cleaned this up on-wiki at the time by moving the documentation on the input method to https://www.mediawiki.org/wiki/Help:Extension:UniversalLanguageSelector/Input_methods/Manchu, however UniversalLanguageSelector was never told about that and to this day continues to link to the help page for the bare language code (https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Extension:UniversalLanguageSelector/Input_methods/mnc, which is interpreted as if it where https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Extension:UniversalLanguageSelector/Input_methods)