I am running a 4200NEX with my S8 and was using HDMI with Unchained Rootless since I got the phone...worked well but some stuff just doesn't display very well on the head unit so I was excited when I got in on the Waze beta for Andriod Auto! I am only interested in Waze for navigation so that's why I never used AA before.
So, now that I'm using it I found that the radio will play over AA when I'm in AA mode, but as soon as I use the voice commands (which you pretty much MUST do for everything), the radio stops playing and cannot restart no matter what I do. Same for all other audio input