Iphone 11 dark shadow in corner

Hi,

I recently got my iPhone 11 and noticed that the lower right of the screen have a dark spot/black shadow. It sometimes goes away after restarting the device. But it’s been happening more recently.

I have send this phone to rapair and they just send it back claiming nothing is wrong and they can't reproduce this. The phone was in the rapair center for 2-3 hours in Poland.

Anybody have experience with the same problem?

I am not amused that my phone is send to Poland and they send it back without fixing anything.

Bob

Ps : I already did a full reinstall without restoring a backup and installing minmal apps with no luch and I did not drop my phone in a lake.