Missing reflections in Apple Vision Pro cinema mode

Hi , when I was using the cinema mode of my AVP , it looked like a real (artificial) cinema, with a structured ceiling and structured floor. The screen brightness and colors were even slightly reflecting there.

I don't know what I did, but now the cinema mode is just a totally black room - no more structures & reflections. when I use any other environment, it's also showing no more brightness and color reflections of the screen.

Is there any setting to turn this on/off or just a bug ? (Restarting all apps and restarting AVP didn't help)

Many thanks for any hints.

[Re-Titled by Moderator]