Addshore added a comment.
My hunch would be that this has to do with the CA cookie domain for things like wikipedia being set to ".wikipedia.org" but the domain for wikidata gets set to "www.wikidata.org". Which would mean this related to wgCentralAuthLoginWiki which is documented on https://www.mediawiki.org/wiki/Extension:CentralAuth and also our default settings for that var which can be found in InitialiseSettings.php '.wikipedia.org' => 'enwiki', 'meta.wikimedia.org' => 'metawiki', '.wiktionary.org' => 'enwiktionary', '.wikibooks.org' => 'enwikibooks', '.wikiquote.org' => 'enwikiquote', '.wikisource.org' => 'enwikisource', 'commons.wikimedia.org' => 'commonswiki', '.wikinews.org' => 'enwikinews', '.wikiversity.org' => 'enwikiversity', '.mediawiki.org' => 'mediawikiwiki', 'www.wikidata.org' => 'wikidatawiki', 'species.wikimedia.org' => 'specieswiki', 'incubator.wikimedia.org' => 'incubatorwiki', '.wikivoyage.org' => 'enwikivoyage', Needs a bit more investigation thoguh TASK DETAIL https://phabricator.wikimedia.org/T225814 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Addshore Cc: Addshore, Reedy, Jonas, Jakob_WMDE, Legoktm, hoo, csteipp, vvv, Framawiki, Lydia_Pintscher, WMDE-leszek, Aklapper, Pablo-WMDE, darthmon_wmde, DannyS712, wildly_boy, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, JJMC89, _jensen, rosalieper, Agabi10, Wong128hk, Wikidata-bugs, Snowolf, aude, Mbch331, Rxy, Jay8g
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