Driving mode media tray missing

I have a Pixel 8 Pro with Android 14; for years I have used my Android phones for car navigation. Like many, I like to use my phone to listen to Pandora, Spotify, podcast players etc. While in Driving Mode, there is... or *was* a tray at the bottom of the screen I could click to view all of the available media providers (everything presented with giant buttons to reduce driving distraction), select the one I wanted to use, and select from the selected provider which music channel, podcast, etc. I wanted to listen to. Recently this tray has simply disappeared and for the life of me I can't figure out what happened or how to get it back again. I've searched through system settings and driving mode settings and if there is anything related to this behavior I haven't been able to find it. I also tried clearing the cache of some apps and many system services, but this has not fixed the issue. Wondering if anyone has an idea what is going on and how to restore this UI element to driving mode.