Diamora, Song of Death boss bug

I was fighting her on my Huntress (Level 52, with a Boar pet with Haste Aura + Trail of Lightning, Level 12 Skill Gem, idk if this information helps anything).

She summoned a wave of adds and then just... is gone. Her HP bar is gone. I can't portal out of the arena or walk out of the arena.

I searched the first 2 pages of bugs and didn't see this problem, so.

Specs:
Win 11
32 GB RAM
Nvidia GTX 2070
Intel i5 8th gen

I don't think my system specs help here, but idk. Gonna exit the game for 15 mins and see if it boots me back to town or whatever.

Edit: Respawned at checkpoint and killed her.