.NET Core 3.0 - WPF, the type 'x:Static' was not found

[Symbai]

Trying to port an existing WPF app to .NET Core 3.0 using VS 2019 Preview. I created a new WPF project using .NET core then imported my existing files, so far everything is fine. But some XML files have errors about:

XLS0414 The type 'x:Static' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

Where x is being defined as:

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Example where I'm using this:

ToolTip="{x:Static properties:Resources.PlayButtonTooltip}"

Example project:
CoreTest.zip

[vivmishra]

cc: @vatsan-madhavan ; @amit-kabra

[Symbai]

I'm closing this as problem is being addressed in WPF repo dotnet/wpf#117