Environment data

dotnet --info output:

.NET Command Line Tools (2.0.2)

Product Information:
 Version:            2.0.2
 Commit SHA-1 hash:  a04b4bf512

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.15063
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.0.2\

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.0
  Build    : e8b8861ac7faf042c87a5c2f9f2d04c98b69f28d

VS Code version: 1.18.1
C# Extension version: 1.13.1

Steps to reproduce

In open project, right-click open folder. Click add folder to workspace, then select a different C# project.

Expected behavior

Both folders will show intellisense, reference counters, have working goto definition, etc.

Actual behavior

The extension only seems to work with the first folder/project in the workspace. All other folders/projects have no reference counter, cannot detect code errors, and when clicking goto definition, it prompts that no definition was found.