Sound not released

[fellew]

When I'm done with, or taking a break from, Spotify other apps (like YouTube) doesn't have any sound. To get it working I have to completely close Spotify from the Settings app. Spotify is the only app this happens with. I noticed it yesterday, but I have no idea how long it has been this way. This is super annoying and drives me insane!

Spotify version: 8.4.24.871 armv7 (Google Play)
Android version: 7.1.1
Phone: OnePlus 5
OxygenOS version: 4.5.13