I am a mod on Mi Yodeya. Today I looked at a certain user's reputation page, only to see that they had received a point back for a removed downvote on a post that I had recently deleted. This was visible to another mod on the site and remained so even after I refreshed the page a few minutes later. I should not be able to see this as it lets me know who the user downvoted, even if only after the post has been deleted.
Screenshot and some discussion is available here (mod only, for the user's privacy): https://chat.stackexchange.com/transcript/message/8932508#8932508
Update: Per the comments, these are visible to regular users as well.