Old window gains focus and moves to foreground when opening new window in `NavigationView.ItemInvoked`

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Describe the bug

When handling the NavigationView.ItemInvoked event to open a new window, the old window unexpectedly regains focus and moves to the foreground after the new window is shown. This disrupts the user experience as the old window should remain in its current state and not interfere with the new window. However, this issue does not occur when opening a new window inside the NavigationViewItem.Tapped event.

Steps to reproduce the bug

<Window x:Class="App.MainWindow">
    <NavigationView ItemInvoked="NavigationView_ItemInvoked">
        <NavigationView.PaneHeader>
            <NavigationViewItem Content="Tapped"
                                Icon="Accept"
                                Tapped="NavigationViewItem_Tapped" />
        </NavigationView.PaneHeader>
        <NavigationView.MenuItems>
            <NavigationViewItem Content="ItemInvoked" Icon="Cancel" />
        </NavigationView.MenuItems>
    </NavigationView>
</Window>

private void NavigationView_ItemInvoked(NavigationView sender, NavigationViewItemInvokedEventArgs args)
{
    new MainWindow().Activate();
}

private void NavigationViewItem_Tapped(object sender, TappedRoutedEventArgs e)
{
    new MainWindow().Activate();
}

Expected behavior

The new window should open and gain focus without affecting the old window's focus or Z-order.

Screenshots

bug.mp4

NuGet package version

WinUI 3 - Windows App SDK 1.6.3: 1.6.241114003

Windows version

Windows 11 (23H2): Build 22631

Additional context

No response