Same issue here. I never had any issues with Pandora until I updated my iPhone to the latest Full solid public release OS18 Not the Beta Version. I never installed the Beta on my phone. 2019 Mercedes E Class iPhone 13 ProMax with OS 18 Stations fail to load on CarPlay. I deleted the app from my iPhone. Unsynced the iPhone from my vehicle, Reinstalled the Pandora app and paired the phone with CarPlay again, did not help any, Same exact issue. Message says "There was a problem loading this content" Pandora still plays on CarPlay but will not display the song playing nor highlight the station playing.
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