Beidat, Archangel of Death can't die

T1 Stagnation scourged map (nightmare triggers randomly) spawned Beidat, I was playing Co-op and we couldn't deal any damage to the boss (the health bar didn't change at all). We didn't have any exceptional mods etc that could prevent us from doing enough damage.

Can confirm with T5 map. ES is taking damage, but no damage to health at all. Using RF and SR (100% burn damage, no other type of damage). Seems to be bugged against RF/SR.

Same here, running a Scourged T1 Estuary with Randomly Shift Into Nightmare Mod, but can't damage Beidat below ES :( Was so happy to find a Scourge Boss :(