nobody can answer for sure if its a defection or just a matter of calibration which is not an option in users hand to do. just to adjust color tint or hue or whatever. Even the apple support has now , at this time , almost zero experience in that specific issue of 12 pro , and if all the production is like that , there is no comparison between a defected screen and normal one ( if thats a hardware issue)
the point is that most people will not understand if the screen is bad or not even if it is compared right next to another (non 12 pro) screen , so no harm ,.
Maybe this is not a hardware issue at all , it could be a a way of reducing power consumption so , as the first tests and reviews run and have an impact on sales , to rate it better , and then after some months to adjust the dipslay's color profiles and etc through software update. We will see....
I couldn't stand it so .. i just returned it back ... and i will wait for the 12 pro max or mini