The closest GitHub issue I could find regarding this would be: github.com/LemmyNet/lemmy/issues/4572

Doesn’t seem to relate to site bans, though. Also doesn’t appear to be planned in the near future, unfortunately. I agree it would be nice if it emailed the user letting them know. I also agree it should show the mod/admin’s name in the modlog. It seems arbitrary for that info to be hidden on the front end.

This is another issue I’ve been patiently awaiting the implementation of: github.com/LemmyNet/lemmy/issues/4699

It’s in the 0.19.5 milestone. It should hopefully help to undo silly mistakes like this in the future.