Layout not rendered when using await IncludeAsync using .NET Core 3

Describe the bug Layout not being rendered when using await IncludeAsync using .NET Core 3.

To Reproduce The following code does not render the layout.

@inherits RazorLight.TemplatePage<MyModel>
@{
    Layout = "_Layout.cshtml";
}
<p>
    @{

        await IncludeAsync("_LetterHeader.cshtml", Model);
    }

</p>

Note that MyModel implements an interface that is accepted by _LetterHeader.cshtml, but I assume that this is not the issue as the letter header renders fine.

The following does render the layout.

@inherits RazorLight.TemplatePage<MyModel>
@{
    Layout = "_Layout.cshtml";
}
<p>Hello</p>

Expected behavior The layout should be rendered when using await IncludeAsync.

Information (please complete the following information):

• OS: Windows 10
• Platform: .NET Core 3.0
• RazorLight version: current branch as at 28/11/2019
• Visual Studio version: Visual Studio Community 2019 16.3.4

Additional context None

[matthewwren]

I believe I have successfully created a Pull Request. Please let me know if that is how you wanted it done. thanks.

[ronnypmuliawan]

Hi all, the Layout is also not rendering on ASP.NET Core 2.2 project.

@jzabroski any timeline to fix this issue or workaround that I can implement?

Information (please complete the following information):

OS: Windows 10 Platform: ASP.NET Core 2.2 RazorLight version: 2.0.0-beta.4 Visual Studio version: Visual Studio Pro 2019 16.4.0