I put some logging in to see exactly how frequent this key gets set. I just log with the current Date() for readability. Here is a set of events: Updating chapter title - time: 2025-05-23 22:02:57 +0000 Updating chapter title - time: 2025-05-23 22:03:10 +0000 Updating chapter title - time: 2025-05-23 22:03:23 +0000 Only the first update actually appears on the CPNowPlayingTemplate. The lock screen and the now playing overview tile on the CarPlay home screen show the correct title. Are these updates too frequent? I'm not sure how to handle this use case if that is true. Users can select a title and then decide to switch to a different chapter as a typical scenario.