FilePicker on MacOS does not always return the file picked

Description

While using FilePicker on MacOS it will regularly return null for the FileResult when a file is chosen. Code below. After a few selects it works. No exceptions or crashes. Any ideas?

Version 17.4 Preview (17.4 build 2366) Runtime .NET 6.0.9 (64-bit) Architecture: X64

        [RelayCommand]
	private async void SelectFile()
	{
		FileResult result = null;
            try
            {
                FilePickerFileType filePickerFileType = new FilePickerFileType(
                    new Dictionary<DevicePlatform, IEnumerable<string>>{
                    { DevicePlatform.MacCatalyst, new [] { "json" } },
                    { DevicePlatform.macOS, new [] { "json"} },
                    { DevicePlatform.WinUI, new [] { ".json" } }
                    });
                PickOptions pickOptions = new PickOptions
                {
                    PickerTitle = "Choose an engine file.",
                    FileTypes = filePickerFileType
                };

                result = await FilePicker.Default.PickAsync(pickOptions);
            }
            catch (Exception e)
            {
                Console.WriteLine(String.Format("Exception {0}", e.Message));
            }
            if (null != result)
		{

<Button Text="Select..." Command="{Binding SelectFileCommand}"/>

Steps to Reproduce

Create a new .net Maui App Add a button. Add a relay command for the button. Use code above to select a file.

Link to public reproduction project repository

n/a

Version with bug

7.0 Release Candidate 2

Last version that worked well

Unknown/Other

Affected platforms

macOS

Affected platform versions

macOS 12, 13

Did you find any workaround?

No

Relevant log output

+[CATransaction synchronize] called within transaction

[cdavidyoung]

Hang means in my app it does not return from the call to FilePicker.

I can’t provide a sample of this happening because it works fine in the standard Maui app. I wish I could. It only happens in my app.

[cdavidyoung]

I have tried my app on both Ventura and Monterey. The FilePicker hangs in both cases.