Notifications don't mute during phone calls?

[whitenack]

Hey all, I'm not sure if this is something specific to my wife's Moto G4 or if it is across all devices with Android 7, but a recent update created a bug where notifications aren't muted during phone calls. This creates a terrible call experience. The vibration motor is so loud that the person on the other end of the line hears it.

I can't find any setting to change to fix it.