- it is not overexposure (proved by C1 itself and RawDigger - bad range is only present in last stop before overexposure, i.e. from ~25K in terms of pixel value)
- it is not lens cast
- it is not lens shift cast
- light is from ~14:00 clear sky sun, and it is not glare, I've taken many shots of colorchecker at the same conditions and I know what I'm doing.
Problem is a bit strange: starting from some brightness all colors have pink cast. It is not very strong, but visible, and especially obvious when trying to set white balance using gray patches of color checker: with problematic patches WB becomes green. Also it prevents any software from creating custom profiles.
I talked to P1 support, but they told me that it is normal and back is fully ok, while it is surely don't.
I found old thread here about the same issue, but advices and suggestions from there are useless, unfortunately:
https://forum.phaseone.com/En/viewtopic.php?f=3&t=17676
So my question is - does anybody have\had such issue, and if it is resolvable - how to fix it? For now I can use that back while not using last stop in highlights, but for me it means I can't use it at all, as I'm shooting only landscapes.
Issue example (exaggerated to illustrate better):

Raws of color checker for anybody who wants to play, there are different exposures and ..363.iiq have only white patch problematic, all gray are ok.
*Link removed by Moderator*