Hey, just doing some testing on this latest build, phone calls seem to be working now, although I get a red border around the app when dialing out, google tells me this is because of 'strict mode' but I have that disabled, perhaps you've hard coded it in the test build? Setting battery mode to 'performance' rather than 'balanced' seems to remove it.
Moto Camera app is still not recording sound though, it gives me a warning "Hardware version does not support Portrait mode", not sure if that's relevant.
Everything else seems to be working good.
Let me know if you need any debug data to help fix these issues.
The red border is due to being a debugging build (-eng), nothing to worry about (although annoying at times) but isn't an issue in final release builds. As for Moto Cam, not sure about that but will look into it asap.