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There we go:

https://forum.team-mediaportal.com/threads/volume-control-no-longer-functions-properly-when-changing-audio-device.135841/

Workaround for now can be EventGhost with MCE or keyboard plugin, it can catch the volume events and translate that to Windows volume Up / Down just not with OSD unless you keep the Win10 one.

Do that here with Flirc + Harmony One atm which works pretty well, reason why I didn't spot this bug earlier