Airplay on AppleTV 2 and Airport Express killed after Roon 1.8 (Build 952)

Roon Core Machine

Synology DS3018xs, INTEL Pentium D1508, 32GB RAM, DSM 7.1-42661 Update 2, Roon v 1.8 build 970

Networking Gear & Setup Details

Fritzbox Cable 6591, several Netgear Switches, WLAN by Fritzbox

Connected Audio Devices

MacMini late 2011 MacOS10.13.6 via HDMI to Yamaha DSP Z7 Surround Amp set as CoreAudio in AudioMidi Setup; AppleTV2 (2x), Airport Express (2x), iPhone13, iPadPro’21, MacStudioPro’22

Number of Tracks in Library

~20.700 stereo ALAC and FLAC multichannel 2.1 up to 5.1 tracks

Description of Issue

If i remember right playback on AppleTV 2 and Airport Express via Airplay stopped after Roon Update 1.8 (Build 952).
Device will show in audio settings – AppleTV 2 now as Roon Tested(?) – and hitting play button is possible and changes to pause, but no music at all (stereo ALAC) will be played, nothing happens in progress bar.

Playback on an iPhone 13 iOS 15.5 and MacStudioPro MacOS14.2 is working as usual.

No changes on the general network setup and no firmware updates on AppleTV and Airport (already latest version).

okee, day 3 and no feedback from support – that’s a sign.

weird, isn’t it. the atv shows the correct ip, the 2 airports doesn’t (no such subnet here available), nevertheless none of the three are useable as output