When you recommend a comment and delete it without removing it from recommended, there is no way to remove the recommendation because the comment doesn't exist.
 

This is strange, it still continues registered in database.

-2 means it was soft deleted. It still exists and it’s available in ModeratorCP -> Deleted Content.

It's really now disappeared when permanently deleting, I think the only error to consider is that the recommended comment is still visible to those who don't have permission (guest).

However, it's still weird to be visible this way after soft delete.

Edited August 19, 20222 yr by Hisashi

Thank you for bringing this issue to our attention! I can confirm this should be further reviewed and I have logged an internal bug report for our development team to investigate and address as necessary, in a future maintenance release.