I have noticed 2 things in the Soulfire Bastion but I’m not sure of they are actually bugs.
The first one would be that the Profane Flesh type enemies (I think they’re called Infernal Flesh) can stun you even if you have the fire shield which makes them deal no damage to you.
The second one is that the Siege Golem type enemies (Necrotic Golem or something like that) don’t have a fixed attack speed for their big charged AoE Siege attack. Sometimes it takes them well over 2 seconds to fire and sometimes around 0.5 seconds which can make it extremely hard to react. Maybe that’s intended, maybe it’s a visual bug, I don’t know.