[Bluetooth] Wrong behaviour when music is interupted by call

[themeles]

I paired a LG bluetooth headset and played music over the headset. Then I received an incomming call.

Before the music stopped, it was played for the part of a second via the speakers.

1. I did not pick up: after the ringing stopped, the music continued to play via the phone speakers.
2. I did pick up: the music continued to play via the headset.

In the 1st case, the music continued playing via the headset after I paused and resumed it.