I had a complete voice-only experience working with AppIntents and AppShortcuts on iOS 27.0 prior to enabling Siri AI. Once I enabled Siri AI, Siri refused to recognize any of the donated phrases in one particular AppShortcut. It still worked for several others. For the AppShortcut that no longer works, Siri responds to some of the phrases claiming the app doesn't support that action through Siri, and Siri responds to some of the phrases telling me I need to open the app to do that. FB24854409 includes a Sysdiagnose file. Note that I'm aware of App Schemas, but none apply well to my app.