Cannot use Scene methods for URL, NSUserActivity, and other External Events without using SwiftUI Lifecycle

I am using the new "pure" SwiftUI App and Scene structs instead of an AppDelegate.

Some of my views accept custom url schemes and user activities using onOpenURL(perform:). Everything works as expected.

However, starting with Beta 6, Xcodes gives the following runtime warning:

runtime: SwiftUI: Cannot use Scene methods for URL, NSUserActivity, and other External Events without using SwiftUI Lifecycle. Without SwiftUI Lifecycle, advertising and handling External Events wastes resources, and will have unpredictable results.

What exactly am I doing wrong? What is SwiftUI Lifecycle referring to?

This is what my main App struct looks like. I am attaching some default modifiers to the main view.

@main
struct MyApp: App {
    @StateObject var viewModel = GlobalViewModel()
    
    var body: some Scene {
        WindowGroup {
            MainView()
                .applyingDefaultColors()
                .environmentObject(viewModel)
                .environmentObject(TranslationProvider())
                .toggleStyle(SwitchToggleStyle(tint: .accentColor))
        }
    }
}