Yeah, I’ve run into that too. When I couldn’t get the live test to work on the same iPad, I switched to using the built-in emulator from App Inventor’s browser view as a fallback.
Not perfect, but it let me keep iterating without being blocked. I later deployed the app to an Android device for real-world behaviour.
iOS testing remains a bit shaky with App Inventor, so while you can technically test the iPad app on device, it’s hit or miss unless everything is configured just right.