It seems my ASI071 may have an issue. I've not noticed this before...however I have mostly used the camera for lunar imaging. I think the sensor must have become damaged somehow, not sure how, but I have two obvious artifacts in all frames, including dark frames:
Master Bias (definitely no light leaks):
Master Flat (note the dark arc in the center is now a light arc...???):
Integrated Lights (not calibrated or aligned...large light spot is there, no arc???):
Anyone ever experienced anything like this before?