By the end of a compass i did after killing all mobs 5-6 maniacs (type of mobs spawned) and they were untargetable and basically immortal. I sorted out the bug by removing my gear so they can kill me and that somehow made them disappear.
The compass i used was 6 wave one, mob that appeared maniac.
Resolved by dying from the 5-6 mobs that spawned after killing everything, keep in mind they do very little damage so if you don’t remove your gear you won’t be able to die from them and access the boss room so you can get your loot.