Nope. I have a P30 and I'm not seeing this underexposure problem.
I have a P30 and when I import files into Lightroom or use ACR as
converter of the RAW files, they are 1.5 - 2 stops underexposed.
Today when I used C1, I also noticed that the previews are also underexposed before/while
they are processed.
When they ( previews ) are processed they look fine.
Do other Phase users observ the same?