Trial of Chaos Stage III Bugged

Currently unable to ascend as the chaos trial is bugged for me. Always happens during stage III. The last 15-20 monsters just don't spawn and I'm unable to move to next stage.

This bug basically soft-locked my character.

Narrowed down the issue. Some of the pillars with monsters on them don't descend.

I'm having same issue in round 3 of my first ever ultimatum trial - running back and forth and there are some monsters huddled and not active (I can swing at them and it ignores them) on ground level by wall, as well as some up high on undescended pillars. Only thing happening is blood balls and lightning circles spawning. Guess I need to die to get out?

EDIT: Didn't realize I needed to be under the floating stone guy/block for it to progress. So that worked... up until I got to the end and after riding the pillar to top level I got a game-crashing texture error. Damn... and upon loading it lost my progress. This sucks. Maybe try a different renderer for trials if a graphics crash loses your progress.