We are experiencing the same issue in our app since a couple of iOS releases.
Everything works fine in the simulator, but on a real device the AppDelegate doesn't get application(_ application:, continue userActivity:, restorationHandler: )
and
application(_ application: continue userActivity: restorationHandler:)
calls anymore. Causing our users to lose the payment entered via Siri.
It's been like this since a couple of iOS / Xcode releases.
Can you try to reproduce on a real device @DTS Enginer?