Can't adjust audio volume when using CarPlay

I have been having the same issue in my 2021 Toyota Prius. I have had this Prius for several years and had no issues with carplay. After the ios 16.5 update, the buttons on my steering wheel and the volume knob on the radio no longer work to control the music on carplay. I know it is not an issue with the buttons themselves because it works fine when the regular radio is playing.

I have installed software updates to the car, deregistered my phone from the car (both car and iphone settings), and changed the cable.

I found a reddit thread where tons of people are experiencing this same issues since ios 16.5. It just randomly started with that ios update.

Having the same issue constantly with my iPhone 14. Partners iPhone 13 has it less.

The only solution that sometimes works are

• Telling the iPhone carplay settings to forget our Toyota rav 4
• making sure only one of our phones has Bluetooth enabled
• Plugging in and disconnecting the phone 4-6 times
• Resetting the iPhone atleast once or multiple times

Updating to the most recent Toyota infotainment center does NOT HELP. These fixes are almost impossible and dangerous to do on the road, so we have to pull over and risk being late just so we can hear our directions/podcast at a reasonable volume. Pulling the phone off Bluetooth loses map navigation.