Usually, when using Waze on Apple CarPlay (I can’t speak for android users) the Bluetooth player is disabled.
They assume you’ll use the device to play music too.
If you have a kosher Waze only device, you’ll have an issue!
You can use the radio though with CarPlay, just not usb/Bluetooth. (Not sure about cd, as I don’t use them anymore!)
(Though sometimes on older model vehicles you can play music via Bluetooth while using CarPlay at the same time.)