Halls of the Damned, bugged cursed chest

Doing a cursed chest event in Halls of the Damned, takes place in the 1st half of the dungeon. I’ve killed everything in the first half of the dungeon (including the 2 side teleport areas), but the cursed chest event won’t end. The goal says I still need to Slay the remaining enemies. So I assume something spawned in a wall or underground or something. Just FYI…