I always use crossfade, but since updating my iOS-app to 80.14.09 yesterday the function seems to have been removed? 

I am listening to music from Spotify. When I open the MacOS-app the icon is disabled when listening on a Spotify-playlist. When I switched to some Sonos Radio-playlist the icon looks enabled, but it doesn’t seem to work to toggle it. I could still not see the option on my iOS-app.