Steps to Reproduce:
Another user mentions me on a talk page (https://commons.wikimedia.org/wiki/User_talk:Preservedmoose). An admin deletes the page and then un-deletes it without the revision in which I was mentioned (https://commons.wikimedia.org/w/index.php?title=Special:Log/delete&page=User_talk:Preservedmoose).
When I next log in, I have an alert in https://commons.wikimedia.org/wiki/Special:Notifications saying that I was mentioned, but the "view changes" link saying "2 revisions of this difference (0 and 351494104) were not found."
The alert should vanish when the page is deleted and not come back when the page is undeleted without the relevant revision.