U3219Q, Mac Mini M1, multiple issues

My new U3219Q does not work well with my Mac Mini M1 (MacOS 11.6):

• Wrong YPbPr Color Signal (not RGB), when change manually to RGB wrong colors
• Not able to update Dell Firmware via USB Type-C connection (Display is recognized in System Settings)
• DDM (Dell Display Manager) does not run (Access allowed in System Settings)
• USB hub does not work (USB upstream port connected)

With my old Macbook (MacOS 11.6, Intel) everything works (except RGB Colors), so the issues are related to the combo M1 and U3219Q.

Updated Dell Monitor Firmware with MacBook, but still not working with Mac Mini M1.Tried USB Type-A/HDMI instead of USB Type-C without success.

Is the DDM only working on Intel Macs? No native M1 version available? Same question regarding Firmware Updater.

Why has the RGB mode a color issue?

Any change in settings to bring the USB hub working?