I am also experiencing this issue. I used to be able to listen to Apple Music while playing MC. After iOS 14 update is when this started. Note: my iPad Pro does not have a mute/screen lock switch so it is not that.
Blitzen
I am also experiencing this issue. I used to be able to listen to Apple Music while playing MC. After iOS 14 update is when this started. Note: my iPad Pro does not have a mute/screen lock switch so it is not that.