Pharyl megalith bug

During boss gauntlet, fought and killed devourer boss, when he died parts of his body left in boss arena, those parts have hitbox and u cant go through them, which at 1st i though was intentional, but last boss spawned in the middle of them and would not even aggro on me, my artilerry balistas wouldnt shoot at him either like he was not there, i killed him with basic attacks. He swung at me once during whole thing, but never got out (Oloton, the remorseless is the boiss that got stuck)