bug with red stones in ultimatum trials

Hello, playing trials of chaos is the second time that it happens to me with a friend that in the challenge of grabbing the red stones to deposit them on the pedestals it bugs and when completing the round it says that I still have the red stone and I am receiving 100 damage per second, it is annoying because the boss trials do not advance until the game decides to stop spawning enemies in the boss area and it is annoying to lose ultimatum due to an error like that.

saw this in a stream this morning.
they picked up a stone but it didn't go on their back (not sure why, i missed the window to clip it) then they went to another stone and it picked up. then they were able to dump all 3 in at once. I think they would have been able to put the first stone in all 3 since it didn't go on their back.