Synology Diskstation + Virtual Machine Manager -> vSwitch -> Airplay Problem !?!

I am using the Logitech Media Server (LMS) on my Diskstation DS720+ (before DS716+) without any problems for several years.
I started in the last days to install and use the Virtual Machine Manager (VMM). In order to use VMM, I have to turn on vSwitch.

The problem:
Since I turned on vSwitch, LMS on my Diskstation finds no Airplay or Chromecast devices anymore. :(

Solution?
Are there any work arounds?
Does anybody else have similar experiences?
Does anybody use successful VMM and LMS and Airplay?

Any help is highly welcome!