You may not have seen it, but it was happening.
If you don't want to believe what I say here, you can see for yourself here:
https://discussions.apple.com/thread/253200214?answerId=255995138022#255995138022
If it wasn't on previous iPhones, where did the examples there from the iPhone 6, 7 Plus, 8 Plus, Xs, 11 and 12 Pro Max come from (as well as the examples from the Google Pixel 3 and 5, Galaxy Note, Galaxy S20, Galaxy S21 and Canon DSLR?)
Apple isn't going to acknowledge something that is normal and expected, sorry.
If you buy a phone with a bad camera that uses plastic lenses you won't see it, as it's more obvious the better your optics get.