I just got a used iPhone XS, my first OLED phone. When I use the phone in a dark room (e.g. in bed), at minimum brightness, the screen appears very washed out, much more so than my old iPhone XR LCD in the same conditions. If I move the brightness a couple ticks (~10%), the problem seems to be alleviated. Is this common to all OLED iPhones (or all iPhones XS) or might I have a bad unit?