FileSavePicker throws "Invalid window handle" error

[datvm]

Description

The following code throws an exception:

        var diag = new Windows.Storage.Pickers.FileSavePicker();
        diag.FileTypeChoices.Add("PDF", new List<string>() { ".pdf" });

        try
        {
            await diag.PickSaveFileAsync(); // Exception here
        }
        catch (Exception ex)
        {
            this.exceptionText = ex.ToString();
        }

System.Runtime.InteropServices.COMException (0x80070578): Invalid window handle. (0x80070578)
Consider WindowNative, InitializeWithWindow
See https://aka.ms/cswinrt/interop#windows-sdk
at MauiApp1.Pages.Index.SaveFileAsync()

Steps to Reproduce

1. Create a MAUI app. Add the above code or use the repo below.
2. Click "Save File" button.
3. Exception is thrown.

Link to public reproduction project repository

https://github.com/datvm/MAUIWinPickerError

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net7.0-windows10.0.19041.0

Did you find any workaround?

This supposes to fix it but right now I cannot find anyway to get a Window hWnd anymore. Also that issue is closed supposedly it's fixed but I am still encountering it right now: #2194 (comment). See #11527 (comment)

Relevant log output

No response

[datvm]

Found workaround for now (finally know how to get the window's hWnd):

            var currWin = Application.Current?.Windows.FirstOrDefault();
            var hwnd = (currWin?.Handler.PlatformView as MauiWinUIWindow)?.WindowHandle;
            if (hwnd is null) { return; }
            
            WinRT.Interop.InitializeWithWindow.Initialize(diag, hwnd.Value);

Thanks to #2194 (comment) and this

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[mattleibow]

This is the issue: microsoft/WindowsAppSDK#1063