Need someone to verify, but the AUX issue looks resolved with me. In one of my cars, I had the AUX issue. Ever since the update, my phone works just fine.
This seemed to fix the AUX issue for me as well. When I unplug the cable while it's still playing, it switches from the cable icon to the headphone icon, and the volume changes due to that setting changing, but it works consistently the way it's supposed to.