Black Cathedral bugged

I was in the Black Catedral for the abyss pinnacle boss, I managed to beat the first instances until he revived at full power, but then I died. Except after respawning, I was still there, and the boss revived in full power, however it's hp was wasn't displayed at the top. after exiting to character selection, I came back to the same situation but with the boss hp being displayed.
After dying a few times, I managed to kill the boss, but I died right after with the drops on the ground, and upon coming back, the boss is just dead and there are no drops anywhere.