If you do the same thing but for steps 3) and 4) you go back to the home screen first then select the other app the music still plays. There must be something in the gesture of swiping an app out of focus (right to left) that causes this.
If you do the same thing but for steps 3) and 4) you go back to the home screen first then select the other app the music still plays. There must be something in the gesture of swiping an app out of focus (right to left) that causes this.