Sadly, it turned out, that my solution wasn't the update which i got from the razer support.
It's the connected Oculus Rift S.
I just pulled the plug and tidied up the HMD and suddenly the crackling was back again.
So i've plugged in the HMD again and the sound is okay again with all 3 output devices
(The PC only recognizes a third audio device since the autostart is deactivated, no additional software or service, like Oculus, is loaded - Oculus/Thrid-party stuff is first loaded when i open the OculusTrayTool or start the Oculus software manually. I
originally did it that way because the HMD then draws almost no power and you can cover the screen without any problems, and i get no "reconnect errors" like many others who just use the standby mode. But well, that's offtopic...)
So this fix would cost a few hundred €.
btw: Razer was also informed immediately.
And yeah, it's not really a Microsoft problem....Software manufacturers like Razer have to adapt to OS innovations and changes, especially since these were most likely also carried out in the context of security - we have had a similar problem 1-2 years
ago.