Turn on Always on Display. Once you turn off your phone it flickers. Then turn it back on you get your colours back and the flickering stops. Also sometimes it does that I turn it off wait for the screen to flicker and then turn it back on again, whi...

Same issue with my s9. Its been happening after the update

Yea same issue always on display seems to make it work on my s9. Its just sad to see updates ruining your phone. Disappointing by samsung