When I was doing an easy darkness mission, I got the Mother-Hen Ship Boss and the darkness started to act very buggy. When you click fast enough, all of the darkness disappears. It comes back when you start to click slower, but it continuously be gotten rid of by clicking fast for the whole duration of the fight.
After Mother-Hen Ship was killed, the darkness went back to normal, as shown when I am flying when the stage is complete. I apologize for the lag in the video, as I had a lot of things open and my OBS isn’t configured for CIU, but I hope the bug was captured well enough.