We are having the exact same problem. Not sure if this will work or not but have you tried to request again the permission to create CarPlay audio apps in this link https://developer.apple.com/contact/carplay/?
carlosaguiar96
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I was also having a crash, in iOS 14 only, on a Self Sizing Collection View Cells when calling collectionView.moveItem(at: fromIndexPath, to: toIndexPath).
The workaround I've found is to switch estimatedItemSize to CGSize.zero just before and change it back to UICollectionViewFlowLayout.automaticSize after calling moveItem, like this:
layout.estimatedItemSize = CGSize.zero
collectionView.moveItem(at: fromIndexPath, to: toIndexPath)
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
This can cause a small glitch in the UI but at least it doesn't crash.
Hope this helps someone.