Based on the behaviour seen on T179338 and recently on other items, I've noticed that old descriptions don't get removed from the ElasticSearch database on Wikidata.
Examples are https://www.wikidata.org/wiki/Q887670 (most languages still show something related to Wikimedia list) and https://www.wikidata.org/wiki/Q184654 (tetteeeeee appears as Dutch description, despite being removed on 15th of August). Only fix is adding some description, but sometimes people only revert vandalism.
I don't think we want vandalism reappearing that doesn't even exist anymore. Also not sure how this works in combination with revisiondelete.
This issue doesn't appear in the mobile app, as it doesn't use wbsearchentities.