I was trying to label some edits for itwiki, so I went to https://labels.wmflabs.org/ui/itwiki/ and requested a workset. However, every edit I try to open returns an API error, which could be either "revision not found" or, more rarely, "missingcontent". Examples:
{ "code": "missingcontent", "info": "Missing content for revision ID 73247173.", "*": "See https://it.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes." }
{ "code": "revision not found", "message": "Impossibile ottenere i metadati per la versione 70189113. Cliccando sul pulsante \"Salta\", salterai questa attività" }
I tried two whole worksets, and no edit showed up. By opening a couple of random revisions directly on itwiki I saw that they're all hidden revisions, however I do have sysop rights and can see them on-wiki.
The browser console tells nothing more (it only copies the API error), I'm using Chrome and switching to private navigation didn't fix the problem. FWIW, I also have 2FA enabled.
The problem is similar to T194457, although here I'm also seeing the "missingcontent" error.