Poisonous Concoction in Colossus fight

Poisonous Concoction from Pathfinder ascendancy its really buggy during Colossus fight in Act 2.
The flasks will randomly blow up in the middle of the arena and do no damage.
It is almost as if its auto detecting the boss in the middle of the arena and throwing a flask at an invincible barrier, really weird to explain you have to play it to understand.
I was using scattershot support, dont know if this is the reason but worth noting.
Thanks for great game hope this gets fixed.

I have the same issue and after 4 months they didn't fix the bug.