Lucas_Werkmeister_WMDE added a comment.
The bad revision is revid 646258, you can also reproduce the title with `index.php?oldid=`; it belongs to page ID 323610, which is `Lexeme:L2274`. Also, there’s a more helpful error message in Logstash that I didn’t see before: > 'wd:Q100' is not a valid entity ID > The serialization "wd:Q100" is not recognized by the configured id builders So this is probably related to the T291823: Remove "old federation" methods from EntityId <https://phabricator.wikimedia.org/T291823> cluster of tasks. I’m not sure what the best solution for it is, though. In T291823#8994616 <https://phabricator.wikimedia.org/T291823#8994616> and the following few comments, it sounds like the solution for such an error message on a client wiki was to edit the current revision on Wikidata so that it no longer contained the `wd:` prefix? But that doesn’t really work well when the error happens as soon as a revision is loaded for the page history. TASK DETAIL https://phabricator.wikimedia.org/T349982 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Lucas_Werkmeister_WMDE Cc: Aklapper, Lucas_Werkmeister_WMDE, Nikki, Danny_Benjafield_WMDE, Astuthiodit_1, karapayneWMDE, Invadibot, maantietaja, ItamarWMDE, Akuckartz, darthmon_wmde, Rosalie_WMDE, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Verdy_p, Wikidata-bugs, aude, Jdforrester-WMF, Mbch331, Jay8g
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