Waze has settings to output to the phone speaker, instead of bluetooth, even when its connected to the car via bluetooth. My stereo doesn't autoswitch to bluet

Waze has settings to output to the phone speaker, instead of bluetooth, even when its connected to the car via bluetooth. My stereo doesn't autoswitch to bluetooth when directions come in, only on phone calls, so unless i want to hear dead air 99% of the time, i dont get directions from google maps which doesn't have such an override.