Microsoft.UI.Xaml.Media.PointCollection throws TypeLoadException

Describe the bug You cannot create a Polygon from code. XAML works. App throws: TypeLoadException: Could not load type ‘ABI.Windows.Foundation.Point’ from assembly ‘Microsoft.WinUI, Version=3.0.0.0, Culture=neutral, PublicKeyToken=de31ebe4ad15742b’.

Steps to reproduce the bug

var polygon = new Microsoft.UI.Xaml.Shapes.Polygon();
 polygon.Points.Add(new Point(10, 110));

var collection = new Microsoft.UI.Xaml.Media.PointCollection();

Steps to reproduce the behavior:

1. Create new Blank App, Packaged with WAP (WinUI 3 in Desktop).
2. Open MainWindow.xaml.cs.
3. Create polygon with points.
4. Run code

Expected behavior The code should work like xaml <Polygon Points="10,110 60,10 110,110" Fill="Blue" />

Screenshots

Version Info

NuGet package version: Microsoft.WindowsAppSDK.WinUI 1.0.0-experimental1

Windows app type:

UWP	Win32
	Yes

Windows version	Saw the problem?
Insider Build (xxxxx)
May 2021 Update (19043)	Yes
October 2020 Update (19042)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	<Yes
Xbox
Surface Hub
IoT

Additional context

[artkat]

This issue seems fixed in WinUI 0.8.5

[Marv51]

As I said: CsWinRT has fixed this, but no update has been released yet. Feel free to upvote that discussion I linked.