App Clip Multiple Invocations

I have the following code, after looking at the Fruta sample app.

Code Block swift
@main
struct MyClipApp: App {
		var body: some Scene {
				WindowGroup {
						ContentView()
								.onContinueUserActivity(NSUserActivityTypeBrowsingWeb, perform: handleUserActivity)
				}
		}
}
func handleUserActivity(_ userActivity: NSUserActivity) {
		print("Handle User Activity")
		guard let incomingURL = userActivity.webpageURL else {
				print("No incoming URL")
				return
		}
		print("Incoming URL: \(incomingURL)")
}

If I just build and run the app clip I get:

Code Block 
Handle User Activity
Incoming URL: https://example.com

Then if I go into my Schema and tick the _XCAppClipURL checkbox and enter a value of https://custom.com?id=1234567890

Build and run the app clip again, I get:

Code Block 
Handle User Activity
Incoming URL: https://custom.com?id=1234567890
Handle User Activity
Incoming URL: https://example.com

See how I have my new custom URL and the previous example URL. Go back into my Scheme setup and untick the _XCAppClipURL option.

Build and run the app clip again, I get:

Code Block 
Handle User Activity
Incoming URL: https://example.com
Handle User Activity
Incoming URL: https://example.com

And now I always get two activities when launching the app clip. Is it normal to get two? And how do you stop the https://example.com activity coming in?