Fail to acquire speakers on car multimedia unit

[marcelo13k]

This happens in my car multimedia unit, running Android 6.01 (Marshmallow)

When the radio app is playing and I launch PA, it does not acquire the speakers, I mean, the visualization "moves" so I know PA thinks it is playing, but the radio still plays on the speakers

I don't know what is the technical reason for this, but if I launch Spotify instead of PA, it does get the speakers too. If I launch other player it also gets the speakers. After Spotify or other players play, PA works fine

This only happens if the radio is currently playing, and only PA fails to acquire the speakers, all other apps do not exhibit this problem.