I have an issue with the game hat 1.5", Whenever I overclock the pi zero 2 above 1ghz I get this problem where there are lines appearing on the lcd.
It looks like this: https://ibb.co/qJsyxhC https://ibb.co/CnhXyk5
This issue never happens when my raspberry pi isn't overclocked. And I think it only does this on retropie since I haven't tested this on the spotpear debian buster image.
Edit: I noticed that there's also red pixels appearing too.
Edit 2: I don't get this problem when I overclock to 1.1ghz 2 overvoltage