The control and the usb connection with iOS work again with the current beta(?) version fe17d430bf5a91f50c03f05f6c238ba6.exe. Thanks for that.
Perhaps this is also an important hint for others:
However, there is the restriction that no teams session is possible with active control and, conversely, no mirroring is possible with an active teams session. It only works in the following order: deactivate Blutooth, start mirroring, then start the Teams session and then activate Bluetooth and control!
I have some additional feedback: The connection via WiFi under iOS is still somewhat unstable. In various situations, including when automatically reconnecting AirPods to the iPhone, the connection breaks down.