4K with HLG and so on (almost all TV sets nowadays are like that).
I know I have to be patient, I just wanted to highlight that there is a problem, a problem that was introduced later.
The (unstable, at least for me) 2024/04/23 beta had no such problem.
I've tried the latest beta and it still has green bars on loading and visible blockiness / artifacts during playback.
It's a bit baffling that an older beta was working good (well, crashes aside) while not one but two releases are crippled and the current beta is just as broken.
For the rest : tried with two HDMI cables and two microSD cards. Changing resolution doesn't seem to fix anything.