It was a iPhone 15 Pro Max using AOD and screen timeout was and still is set to default 30 seconds. It was just a faulty OLED panel, because after 5 months the two battery widgets and my wallpaper font burned into the panel. The Apple Genius told me it's very rare and OLED panels with AOD shouldn't burn in with only 5 months use. My screentime for the phone is less than 3 hours too. So it was just bad luck and not the home screen being left on just the default AOD. I was guessing with the Apple Store workers that maybe pixel shifting should help in the next iOS update and also maybe every time I was getting a notification the AOD lights up briefly than dims after a few seconds. I was saying it shouldn't brighten up and stay dim unless a face is detected and maybe the constant AOD going from dim to lighting up the screen back light every notification was a issue maker too.
Now I have AOD, no widgets and no wallpaper set with less than half brightness set at all times.