I have an AOC U27G3X 4K gaming monitor that I use both as a TV and for gaming on a Nintendo Switch 2 console. Recently, something very strange has been happening to it. After playing a game that has an on-screen timer for a few minutes, the last digit of the timer (the one rapidly flickering from 0 to 9) appears to burn in on the monitor. Going to a different source or power cycling the monitor does not help; there is a constant flickering area on the screen where that digit was.

It seems strange that only that digit would burn in, and NOT the other digits that are changing less frequently....