Yup, this happened to me. Android Auto worked yesterday, but not outputting any sound today. I combed through logs and did tons of troubleshooting earlier, but could not figure it out. Glad it’s a known issue, at least.

After quickly searching saw you can disable automatic updates in developer options. Since I use AA exclusively I don’t want it messing up!

This is why I don’t ever update until I’m forced. Probably a bad idea for security sake but here we are. Either it doesn’t work, or it gets hacked and it doesn’t work.