dotnet build of aspnet core on net461 with net461 dependencies don't build

Steps to reproduce

Create new project in VS

• ASP.NET Core .NET Framework Project
• .NET Framework class library child project
• Reference class lib from web proj
• Add “var foo = new Class1();” and appropriate using to Home controller.
• dotnet run in web project from CLI.

Expected behavior

• successful build and run

Actual behavior

C:\Users\rich\Documents\Visual Studio 2017\Projects\WebApplication3\WebApplication3>dotnet build
Microsoft (R) Build Engine version 15.3.388.41745 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

Controllers\HomeController.cs(8,7): error CS0246: The type or namespace name 'ClassLibrary1' could not be found (are you missing a using directive or an assembly reference?) [C:\Users\rich\Documents\Visual Studio 2017\Projects\WebApplication3\WebApplication3\WebApplication3.csproj]

Build FAILED.

Controllers\HomeController.cs(8,7): error CS0246: The type or namespace name 'ClassLibrary1' could not be found (are you missing a using directive or an assembly reference?) [C:\Users\rich\Documents\Visual Studio 2017\Projects\WebApplication3\WebApplication3\WebApplication3.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:02.04

Then build wen project in VS 2017 15.3 Then dotnet run and everything works.

Environment data

dotnet --info output:

C:\Users\rich\Documents\Visual Studio 2017\Projects\WebApplication3\WebApplication3>dotnet --info .NET Command Line Tools (2.0.0-preview2-006497)

Product Information: Version: 2.0.0-preview2-006497 Commit SHA-1 hash: 06a2093335

Runtime Environment: OS Name: Windows OS Version: 10.0.15063 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\2.0.0-preview2-006497\

Microsoft .NET Core Shared Framework Host

Version : 2.0.0-preview2-25407-01 Build : 40c565230930ead58a50719c0ec799df77bddee9

[livarcocc]

Are all these SDK based projects? Could you share the repro projects?

[livarcocc]

@richlander as we talked, this is an issue with how often VS saves the project file. If we need to change this, we should start with the project-system repo.