When the screen is fully or mostly black on my s23 ultra there is a very dull green colour. It also flashes a green dull colour before turning off and the screen going fully black. When doing a display tester and it comes to the black colour the screen is once again slightly green. Not sure what this issue is if it's hardware or a software issue.
Yes it does still happen in safe mode and after the cache has been wiped. I've also done the diagnostics and it's found nothing wrong. Might have to contact samsung but thank you for your advice 👍