When the screen is black, calls that are incoming don't light up the screen, nor do they make any noise. As soon as I interact with the device by touching the screen, lifting it, or pressing the on button, it starts ringing just fine. Nothing else appears to be wrong, I can make and hear calls, they just don't ring for me when I'm not actively using my phone.
I've tried every setting I can find, granting all permissions and battery usage. I tried making the clock stay on the screen so that it remains always on. Even went so far as to enable all sorts of privileges to google play services in case that was the app which was waking up the screen.