MacMini M4 connected to 30" CinemaDisplay > Display is not switched off in standby mode

Hi there,

I have connected my 30" Apple Cinema Display via powered (HDMI to USB-C)-Adapter + (Club3D USB-C to DualLink-DVI) Adapter.

Everything works except the "switch off" the CinemaDisplay. In sleep-mode the display is normally switched off with M1 (Led on Display is visible). On M4 the display stays on with grey background. If I wake up the M4-Mini the display is shutdown for one-second (Led visible) and then it's instantly turned on.

Would be nice if apple fixes this. My currently workaround is switching off the cinema display manually. Not very handy. If you need a video of this behavior please let me know.

Thx!