Hi,
I can confirm the same behavior with the latest Stellarmate (1.4.6) and also with my own MATE based stack which I compiled about a month and a half ago using github versions of INDI but mostly bionic sources for other libraries. It ignores the capture format setting and leaves the camera to FINE after you have unplugged it. Preview and saved image comes as JPEG unless you chose FITS.
In fact FITS doesn't exactly work fine either. It has 8 bits per channel.
Clearly something with that model.
ASIAIR works correctly though and I believe it too has INDI under the hood. However, ASIAIR does not touch the format at all. I know this because it will stick with whatever I have chosen on the camera. So perhaps it is just the "set format" operation that is flawed and a possible workaround would be to disable it completely and just use what the camera has? I will try to see if that is feasible.
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