Unable to build SceneGraph - Missing Microsoft.ui.xaml.dll

[Natriss]

After I downloaded the project from GitHub I couldn't open any App because it's missing the Microsoft.ui.xaml.dll file.
After adding it, it still asks for it.

[Natriss]

I did copy all of the SceneGraph content to new Blank WinUI 3 - WASDK 1.6 Apps/Class Libraries.
That fixed the Microsoft.UI.Xaml.dll missing part.
The code is completely broken even the small this assigning values to read only properties.

Could it be updated to WASDK 1.6 and checked if everything works how it should be?