DBus OpenFolderPickerAsync returns an empty list on Ubuntu

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Describe the bug Calling OpenFolderPickerAsync returns an empty list on Ubuntu. Works fine on Windows.

To Reproduce Steps to reproduce the behavior:

var paths = await window.StorageProvider.OpenFolderPickerAsync(new FolderPickerOpenOptions() {
					Title = "Select folder"
				});
Console.WriteLine(paths.Count.ToString());

Expected behavior 1, but I got 0 instead.

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 20.04.5 LTS
• Version: 11.0.0-preview4

Additional context I've also noticed I cannot select an empty folder. I have to select a file within a folder, otherwise the "open" button is disabled.