The Black Crow Boss

I have Encountered this boss multiple times mapping and every single time this boss bugs out, at a certain HP threshold it bugs out and starts to do infinite red unlockables and refuses to grab the bell. only solution is to let him kill you and lose all your exp.

Same here. They could have just disabled the spawning for black crow in boss maps until its fixed.

This is frustrating because not only exp is lost, all the map contents such as breach etc are lost if u attempted the boss without completing them.