Trial of Sekemas, boss disapearing

Hello, so during trial of Sekemans on 3rd boss (scorpion), boss just jumped over the gate. It lingered for a while, while I could not eaven hit it. Boss disapeared and I am locked in the boss room, with objective to kill it, while it just went missing. Is there anything to do about it? For now I will try to restart the trial.

Going to character screen made me able to try it again, but still, boss jumped over the wall

To minimize the risk you can always end burrow phase as soon as it starts by activating floor trap, assuming you can deal with the consequences. But yeah, this bug should be high priority... among other nearly 60k bug threads here:) No idea how ggg will keep all their promises with this.