My Iphone X screen has this shadow on the top

No happens with any wallpaper see that M shaped symbol

Apple store guys did replace my screen which did not resolve the problem and upon speaking to customer service they said they will send me a new phone but the issue still happens on new phone too. Thing is this issue is happening across all iphone x devices. Most of my colleagues also have the same issue but apple is not ready to accept the issue. I am jus living with it

Notice the difference on both the images both are with the same wallpaper. This shade isnt coming always. Sometimes its dark and sometimes its little light.

Thanks

I am going to visit an apple store this weekend and see what the support team there has to say about this. If thats not a burn it thats good, but i am concerned about the way that it is looking right now.

Tested with a new wallpaper and this shadow is on the left now and not visible in white light.i could see this only in the dark Man i think my display has gone real bad