Issue seems to be fixed for me as of the last update too. Thank you for making the effort to get this sorted out!
Scan lines and pink lines seem to be fixed on os 12.0.0 build 4178. However still getting some kind of blinking/light flicker. Not sure what is causing.
I’ve had that as well. Try a system restart in the power menu.
So i just got a brand new roku tv and when i tried to play on my ps4 after getting off for a few hours i was met with a black screen i tried looking for a software update and tried new hdmi cords but none worked so i just wanted to watch youtube so i go on youtube it looks normal so i go on a video but i hear everything fine but no screen its just completely black.
I think I've run into this issue a handful I've times. You could try restarting the TV (not factory reset} under the power options in system settings and see if that helps. Good luck!