It is already and old bug, but in the story quest of the The Fridgid Eyepatch there is a bug. At the end, there a few mobs around the boss and a red crab will spawn over time. If you have killed the boss you will get the popup of the tralala-song even if the red crab isnt killed yet. You can't fight the crab while the popup is active.

Pls fix the tralala-popup and don't show it until all mobs are gone.