Repro

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <PackAsTool>true</PackAsTool>
    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
  </PropertyGroup>

</Project>

dotnet build

Expected
Build the project and produce a nupkg.

Actual
dotnet build fails

C:\Program Files\dotnet\sdk\2.1.300-preview2-008523\Sdks\NuGet.Build.Tasks.Pack\build\NuGet.Build.Tasks.Pack.targets(326,5): error MSB4006: There is a circular dependency in the target dependency graph involving target "_WalkEachTargetPerFramework". [C:\dev\natemcmaster\tmp\tmp.csproj]