OpenFilePickerAsync() w/ FilePickerOpenOptions: If FileTypeFilter is non-null, SuggestedStartLocation only works once? (macOS)

[werkflo]

I'm playing with OpenFilePickerAsync(). If the FileTypeFilter of FilePickerOpenOptions is set to null, SuggestedStartLocation behaves as expected every time.

However, if the FileTypeFilter is set to something non-null, the SuggestedStartLocation works only the first time OpenFilePickerAsync() is called. The second time it is called, the starting location will be wherever the picker was left after the first call.

Quitting the app and re-launching will cause the SuggestedStartLocation to be respected again, but only the first time OpenFilePickerAsync() is called.

If it matters, I'm running this on macOS and Avalonia 11.2.3. Any assistance would be greatly appreciated.

Reproduction

Make 2 folders on your Desktop:

• one called "Target Folder"
• the other named "Target Folder 2"

And then run the following code:

    private async void Button_OnClick_WithSpaces_COMPLEX(object? sender, RoutedEventArgs e)
    {
        await TryToOpenFolderOnDesktopWithName_COMPLEX("Target Folder");
    }
    
    private async void Button_OnClick_WithSpaces2_COMPLEX(object? sender, RoutedEventArgs e)
    {
        await TryToOpenFolderOnDesktopWithName_COMPLEX("Target Folder 2");
    }
    
    private async Task TryToOpenFolderOnDesktopWithName_COMPLEX(string folderName)
    {
        var basePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        var targetPathWithSpaces = Path.Combine(basePath, folderName);
        Console.WriteLine($"Trying '{targetPathWithSpaces}'");
        var result = await DoOpenFilePickerAsync_COMPLEX(targetPathWithSpaces);
    }
    
    private async Task<List<IStorageFile>?> DoOpenFilePickerAsync_COMPLEX(String? providedPath)
    {
        if (Application.Current?.ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop ||
            desktop.MainWindow?.StorageProvider is not { } provider)
            throw new NullReferenceException("Missing StorageProvider instance.");
        
        // Setup the starting folder
        IStorageFolder? startingLocation = null;
        if (providedPath != null)
        {
            startingLocation = await provider.TryGetFolderFromPathAsync(providedPath);
        }

        if (startingLocation != null)
        {
            Console.WriteLine($"-- Good starting location found - {startingLocation?.Path.AbsolutePath}");
        }
        else
        {
            Console.WriteLine($"-- startingLocation is null");

        }


        var filePickerOptions = new FilePickerOpenOptions()
        {
            Title = "Choose an XML file",
            AllowMultiple = true,
            FileTypeFilter = new[] { FilePickerFileTypes.TextPlain },
            //FileTypeFilter = null,
            SuggestedStartLocation = startingLocation,
        };
        
        
        var files = await provider.OpenFilePickerAsync(filePickerOptions);

        return files.ToList();
    }