This does work on an M1 Mac - confirmed with a few scaled down test projects.

Having a way to reset this Safari preference would be very helpful if someone wishes to be presented App Clip cards once more. Would love to hear if there is a way to do this! Thanks for any help!

Thank you for your reply. Today the songs are playing as expected. If this begins to happen again we will create a bug report with the sysdiagnose, date and time.