As the title say: Spotify begins with "you're offline". So the Running feature is not present. But all the music is available and I got no offline music on my Spotify. Offline mode is off (in the settings) restarts have been made (both types) reinstalled and it worked once, but as soon as the app is closed and reopened I'm back to "you're offline". Logout/login, same issue.
This is a bug, and certainly not expected behavior for an app.