Can't use microphone on Gboard to enter text in Google Messenger when Android Auto is plugged to USB

Question

When I'm stopped it is much faster to view and respond to text messages via Google messages and Gboard voice entry  on my phone.
This has always worked previously, and works with other apps like Facebook messenger, but not Google Messenger.
If I want to use the voice to text on Gboard, I need to unplug USB to disable Android Auto and then plug it back in when I want to use maps.  Or I'm forced to use the keyboard which takes much longer for my big fat fingers.
I know you can use Android Auto voice messaging, but it never works correctly ,takes way too many steps and it's just not worth using.  
It is 10 times faster to just grab my phone when stopped, open my messages and dictate a response quickly.
Does anyone know why this feature stopped working?

Aashi - Android Auto Team · Accepted Answer

Hi Maury, 
We would like to know if you are still facing this issue . We are currently investigating this issue. It would be great if you could send us a bug report from your phone to diagnose the root cause of the issue. We'll send an email with the instructions on how to capture a bug report. Please reply directly to the email with your information.
We understand this could be difficult under the current COVID-19 circumstances, and we would only like to ask you to participate at your own convenience. Thanks!