My MacOs MacBookPro has all updates applied. For a while now when an emoticon is displayed in a message window (iMessage/SMS etc.) it is displayed as a box with a question mark. You can see that in the list of threads on the left it is correct, but in the thread itself (the right pane) it is messed up. I know that a while ago I was trying to save space by deleting some "unused" fonts, and I think I might have caused the problem but I dont know how to fix it.
Looks correct in the list of threads in the left pane:
But is a box with a questionmark in the body in the right pane: