Ingrid killing herself also broke the spell of shattered sight, if that means anything. Do we know any other examples of killing a magic user stopping their magic in this show? I think Killing Medusa saved Charming, right?
It’s happened a lot on the show. My only answer is that the original dark curse needed TLK but not all curses do. I’m trying to think of other examples but it definitely has happened. Was Agrabah restored once Jafar was defeated? When Pan’s shadow was “killed”, Blue Fairy was no longer “dead.” Also when Arthur was killed, presumably Guineviere’s curse was lifted as was Camelot’s right? I know we didn’t see that but still.