We had just killed Haroktha, after finishing the first boss encounter with the brigs, but I died. I respawned before the weapon surrender area for some reason and the door was permanently closed. I went back to investigate and it pulled my friend into the encounter we had just finished and we had to do it again, we thought we were lucky because it no longer was a darkness zone so we could respawn as we like but as we found, right after defeating it again, the door just doesn't open up again, making us have to abandon all progress we just worked hard to get to. It's extremely frustrating especially because there are no checkpoints meaning we'll have to restart from the beginning after spending maybe 30 minutes getting to the final boss.