After a couple of days usage I have a few issues to post.
First let me say thanks to all the pioneers who have made this possible.
There are a few issues though and maybe it is just glitches in the Mazda f/w as I don't think the core code of that has been modified but merely subfiles called by the core have been changed to make it FIAT again.
First, I am experiencing restarts and reboots with a black screen but the audio still plays and Waze still gives audible directions. I'm still seeing if a new USB C cable will fix this but I did notice one time that Android Auto had stopped or was suffering from a memory bleed on my phone.
Second, the two buttons to control either Waze or the audio player app are not functional at all. See the attached photos.
Also, when exiting to the FIAT menu I see this.
Lastly, Android Auto will not recognize SiriusXM as a player via voice commands . It will play TuneIn Radio and switch inputs even using voice commands. For SiriusXM it tells me I need to install Google Music on my device (phone).