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Viewing deleted pages in Wikidata does not show labels
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Description

When I attempt to view a deleted page revision in Wikidata (e.g. https://www.wikidata.org/w/index.php?title=Special:Undelete&target=Q97657423&timestamp=20200810020343), I expect to see a table of labels, descriptions, and aliases at the top, as for not-deleted pages. Instead I see a string like "$?UNIQ868cbb21f8405a0c#2$". This makes it harder to review deleted items.

In this thread, another user reports observing the same behaviour.

image.png (356×928 px, 34 KB)

Event Timeline

Change 628047 had a related patch set uploaded (by Jakob; owner: Jakob):
[mediawiki/extensions/Wikibase@master] OutputPageBeforeHTMLHookHandler: run for Special:Undelete

https://gerrit.wikimedia.org/r/628047

Change 628047 merged by jenkins-bot:
[mediawiki/extensions/Wikibase@master] OutputPageBeforeHTMLHookHandler: run for Special:Undelete

https://gerrit.wikimedia.org/r/628047

It's now much better than it was, but there still seems to be a problem, possibly related to my use of the "Use a compact language list, with languages relevant to you." option. When looking at deleted versions of https://www.wikidata.org/wiki/Q101239641 just now, I saw a table of three languages, showing no labels or descriptions, and with no option to see "All entered languages". In fact, the item had both label and description in French, but there was no way I could see this.

Unfortunately, I cannot offer a reproduction of this issue as I have since undeleted this item.

Update: I have filed this as a new bug report: T269275