Google Music - All playlists are empty. What happened?

[AC Question]

Google Music - All playlists are empty. What happened? I have a Nexus 6 - Android 6.0. Was listening to songs 30 minutes ago and now when I checked I have all songs in my "default" album (latest added) but my own playlists have lost all information. I did not do anything with my phone except for updating some random and common apps like Messenger, Twitter, etc... All trusted apps so to speak.

Any way to get my playlists back?