Crash in `Microsoft.VisualStudio.DesignTools.WinUITap.dll`

### Describe the bug

I thought it was due to live visual tree, but it still happens after closing it.

### Steps to reproduce the bug

1. Create a new C++ Winui3 packaged project
2. In the button click handler, use this code
```cpp
void MainWindow::myButton_Click(IInspectable const&, RoutedEventArgs const&)
{
winrt::Microsoft::UI::Xaml::Window window;
}
```
3. Build and run with debugging in visual studio, click the button, app crash.

### Expected behavior

_No response_

### Screenshots


### NuGet package version

WinUI 3 - Windows App SDK 1.5.5: 1.5.240627000

### Windows version

Windows 11 (22H2): Build 22621

### Additional context
[Repro](https://github.com/HO-COOH/WinUI-Bug/tree/main/14-XamlVisualTreeCrash)

_No response_

Start with the linked 14-XamlVisualTreeCrash repro, build the C++ WinUI 3 packaged project, and run it under the debugger. Trigger MainWindow::myButton_Click with the Microsoft.UI.Xaml.Window declaration and inspect the resulting crash in Microsoft.VisualStudio.DesignTools.WinUITap.dll. Done means the reproduced button click no longer crashes the app.

Written by the indexing model from the issue text.