2019 Bluetooth iPhone pausing music mutes navigation???

A friend of mine just got her first Prius. I noticed that when she has her iPhone XR hooked up to play music, and wants to use the phone navigation, pausing I music will mute the navigation from the phone. I didn’t think this sounded right, but I have tested this a few times in her vehicle and it does seem to be the case... you can only hear navigation if you also hear music

Can someone else verify this issue, or let me know if there is some setting that fix it?