I discovered an issue with this bèta version running on my Raspberry Pi 4 (4 GB).
After finishing playing a movie, starting a second movie doesn't work. The rotating wheel appears for a few seconds, then the screen goes dark and then returns to the UI.
If starting a film with HDR, then the UI returns in HDR too.
Only rebooting the Pi solves it.
I installed a full metal cooling case which keeps the CPU steady at 50 degrees Celsius. So no cooling issues.
If you guys need logs, let me know. I'm happy to provide them.
I have similar issue that when i play movie it goes black 1 second and then it shows the HDR logo and it goes back iam not sure its the cable.