Derelict Mansion boss bug

The map with the double boss was bugged for me in the campaign and now has bugged so hard in a map I cannot leave the boss room...I can't re-spawn at checkpoint like in the campaign so I guess I have to quit and wait until the map closes?(cant even use portal). To give a bit more detail, This is a "powerful boss" map in which I had to do other maps around it to unlock. An abyss spawned in area and I killed everything in a few seconds including the boss who was dancing but, the other boss has somehow teleported out of the room and is unreachable. I have screenshots but idk how to upload them lol.