Yep. Frustrating isn't it.
Also, if you pause, leave the app for a while, come back to resume, it has to re-login to your MS account before it will show you the old "Now Playing" list of songs. The login process is rather slow, depending on if you're on Wi-Fi or cellular data. Also if you waited to long to go back into the app, it won't remember what was in the "Now Playing" list no matter what. Now THAT'S really frustrating.
Oh, the last frustrating thing, for me, is that it doesn't always default back to the "Now Playing" screen, it goes to the "Songs" list, or sometimes to the "Artists" list.
Overall, on a scale of 1-10, I give Groove Music a 1 for being a really crappy app.