When my Sonos Playlist contains Apple Music Dolby Atmos tracks, those tracks will NOT crossfade. The first track has to end fully before the second is heard but starts 10 secs in (ie. no 10-second fade-up).
Crossfade works fine with non-Atmos tracks.
Is the Sonos bandwidth just not up to playing two Atmos tracks over one another?
(I have a Sonos Arc with sub and surrounds.)