SO after getting two brand new iphone 12 pro max, after ordering Like 9 models , i can confirm all fot this weird LCD like screen in pitch black room on a blakc wallappaer in full screen in photos apps ( to reproduce the issue easily ) or even by jut booting each phones out of the box in my bathroom with no lights on , ( you see this grey flicker...
I got 2 12 pro max today starting with F2 week 51 of production, like most of the ones i got , it's way better than the last one i got starting with G0... the issue is still present but barely visible specialy on one model + no yellow tint...
So i send pics to apple, and they confirmed to me THAT THEY DO NOT READ THESE FORUMS... AT ALL...
if u cant this minor issue ( in their opinion and i agree ) to be fixed , you need to call them and spend 30 min or 1 hour max with tech support and explain them all of this.. issue is software cos it never happen with brigthness at 100% and when the phone boot at first, the screen is perfect , you see the apple logo and then the grey flicker comes for a few seconds, it means that so cores components that initialize when booting up like all the sensor in the notch must be causing a little software bug that most ppl do not see.
they do have enough reports of this specific issue.. if all the people here were to call them maybe they'll will really look into the issue.. i've send pictures to them, spent some time with them, and it's the only solution for a fix to be coming ASAP.
hope most of you will calll them . otherwise they may fix it when 13 is released..