Demon Vault, Valdo Map Bug Report ID: #2,991,940,511

My mission was to complete abyss to get reward, BUT !! ,
my abyss went end of room and could not move (maybe one issue). BUT it spawned 1 or 2 monster at time, wery slowly, so not because i slack dps or clear, monsters spawned so slow it bricked, how can i complete if game doesnt allow me to do ?

what happened:
abyss went in room where prob could not move forward?
abyss didnt spawn monster that i could complete it ?