Today something strange happened. We went to check Zushuka but there was only ice cubes and 1 frost servant, but no sign of Zushuka. The chance of she despawned is almost zero because I checked 1 hour before this and my friend checked 20 minutes before this.
So the only thing I can think of is that the ice cubes respawned during or after she was killed, is it possible?
Edit: The boss was indeed killed