M4 is different! With MacMini M4 the 30" CinemaDisplay is working either with Club3D USB-C Adapter or HDMI to USB-C (powered) and Club3D Adapter, but there is an issue that the Display is not switched off in Standy, it stays grey and the LED is not on. Within wakeup the 30" is shortly switched of (1 second) and then it goes directly on.