Kabala boss in map is gone but bossfight still going

She did the spike arena attack and after it finished I was far away from her.
Because of this, she went under the ground but it's not going up again.
The boss music is still going and the map is not cleared as 1 monster remains.
Arena is of course blocked and can't teleport out.

Bug Report ID: #3464250513

Closed and reopened the game, but map is still the same, and boss is still gone.