I don't know if you're able to see my other responses below - yesterday the web UI for direct replies was multiplying the number of characters in my response by -1 and saying there was no text to send, but that seems to be fixed. I wrapped all access to AVAudioSession in a facade so I could log if somehow my code were reactivating the audio session when the application is activated, and it is not the culprit. The notification is not triggered by my code interacting with AVAudioSession.

Specifically: My app is playing Switch to Apple Music and play something there My app receives an interruption started (correctly) Switch back to my app with Apple Music still playing 40% of the time my app will receive an interruption ended notification that should not be sent and Apple Music stops playing. 60% of the time it works as expected.

Well, crap. Having worked on software with plugin APIs (I'm one of the authors of NetBeans), I get not wanting a plugin to be able to run amok. That said, there are those of us greybeards out there who know a thing or two about actual software engineering, and can write stuff that doesn't explode on contact. It would be nice if there were some sort of way to get whitelisted for in-process loading, either by Apple (as it does for Logic's built in plugins) or by the user. Sigh.