I have this as well on my iPhone 13 Pro. It’s like a green ‘band’ from the top to the bottom in the middle/right part. It’s most visible with grey colors and low brightness. iPhone settings in dark mode is a nightmare.
I had this problem too on my iPhone 11 Pro, but I had that one for 2 years and I don’t remember if I already noticed it in the first year. But this is unfortunately really common for OLED screens. Before I had an iPhone I had numerous Nokia/Microsoft Lumia Phones (until windows phone was doomed to die) and they all had it as well.
Does anybody had any luck returning the phone, and with what severity of uniformity issues? Normally I read the entire thread but it’s gotten really big already…