是什么让msbuild等待另一个节点构建同一个项目？

Question

我已经进行了两次并行测试构建项目解决方案的测试，看看会发生什么。原来一个MSBuild节点在尝试构建我的解决方案之前等待另一个节点完成，然后说它是最新的。例：

<!-- ProjectA.proj -->
<Project>
    <ItemGroup>
        <Project Include="MyProject.sln" />
    </ItemGroup>

    <Target Name="Build">
        <MSBuild Projects="@(Project)" Targets="Build" BuildInParallel="true" />
    </Target>
</Project>

<!-- Test.proj -->
<Project>
    <ItemGroup>
        <Project Include="ProjectA.proj" />
        <Project Include="ProjectA.proj" />
    </ItemGroup>

    <Target Name="Build">
        <MSBuild Projects="@(Project)" Targets="Build" BuildInParallel="true" />
    </Target>
</Project>
<!-- When I check the build log it says 
    1> Project is building MyProject.sln (2) ...
    1> Project is building MyProject.sln (2:2) ...
    2> Building with tools...
    2> ...
    2:2> Building with tools...
    2> ...
    2> ...
    2> ...
    2> Done building
    2:2> Target ... skipped because it was previously built successfully
    2:2> Done building
-->

这是一种理想的行为，但是当我尝试依赖它来构建构建服务器时，我的项目会同时构建两次，给我带来很多错误。

我不明白其中的区别，也不知道如何找出问题。