I think like doesn’t realize that I have changed the ownership of my post to someone else. When I then like the post, I get the “One person likes this. Like it too” option and not the red heart. If I click on the left part, my own picture shows up. If I click on the right part, I briefly get “undo like” and it goes back to “Like it too” immediately.
Probably easy to replicate but I can’t do it on try or meta, obviously.