I'm using alpha-build-703-play on a an LG G5 with Android 7.0
Just developed a bug after months of daily use which has been resolved by phone power down.
Shuffle mode - All songs - worked as normal until play was paused and restarted then the shuffle mode only shuffled songs from the last album I played, not the last album the shuffle mode was paused on but the last album I had selected to play through a few days before. It would still shuffle those songs but only those.
Seems okay for now since turning the phone off and on - closing the app only did not fix the issue.