As a smatwatch user and headset with built-in control user, I +1 this bug as launching the default music app and then apply the 'play' is the expected behavior when using the play/pause button when the default music app is not yet launched.
As a smatwatch user and headset with built-in control user, I +1 this bug as launching the default music app and then apply the 'play' is the expected behavior when using the play/pause button when the default music app is not yet launched.