Iphone 13 Pro Max keeps getting a blurry top left corner

I know that i can temporarily fix it by going to settings and switching the display form light to dark and/or back again. But that's not a permanent fix and it's driving me mad. This issue has been known since at least 2020 (checked community questions) - my question is after paying 1500$ for my phone I don't expect to have to keep repeating a 'workaround' 2 years after the issue was first raised on this forum. Does anyone have a permanent solution? I will say that the issue disappeared for a few weeks, but yesterday it started again.