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×tamp=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.