I have some more details. Looks like the ProRaw pixel buffer is not so raw. It has at least some kind of boost.
Is it possible to disable it and get a real raw? I mean, demosaic is ok, but everything else breaks our flow.
Take a look at examples. These photos were taken using exactly the same exposure duration and iso. The difference is how much light is on the photo (the second one is actually darker, it doesn't have any local light while the first one has).
White level is 4095 for both photos according to the DNG tags (avCapturePhoto.metadata["{DNG}"]["WhiteLevel"]).
Desman
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I have a feeling that BlackLevel and WhiteLevel in DNG tags (0 and 4095 respectively) are not correct.
Either so or downgrade the iOS to 14.5