skull key

I just got the skull key and then found junimo kart already open but the quest won’t go away. I feel like this save is just really glitched and can’t be fixed lol

I am playing a coop game, me and my partner were mining at level 119, I died and my partner quickly went down to level 120, while I was in the death animation/conversation with linus they received the skull key and quest, after the conversation finished I had the key but not the quest. Is the...