Generated file doesnt appear in VS project explorer

[enricosada]

Generated file doesnt appear in VS project explorer

How to reproduce

1. launch Visual Studio
2. open example-sdk\example2\Example2.sln
3. run the build of the solution, it succeed
4. intellisense work
5. but l1.Contract project doesnt show the generated file

Expected behavior

The generated file is shown in the project explorer

Environment

Microsoft Visual Studio Enterprise 2017 
Version 15.7.5
VisualStudio.15.Release/15.7.5+27703.2042
Microsoft .NET Framework
Version 4.7.02556

Installed Version: Enterprise

NuGet Package Manager   4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Visual F# Tools 10.1 for F# 4.1   15.7.0.0.  Commit Hash: 173513e369ffb7a1c4d5dccf83696d9aac2ab2d0.
Microsoft Visual F# Tools 10.1 for F# 4.1