Issue Description

when building MSBuild in -mt mode there is this inline task definition in MSBuild.csproj

  <UsingTask TaskName="ValidateMSBuildPackageDependencyVersions" TaskFactory="RoslynCodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
    <Task>
      <Code Source="ValidateMSBuildPackageDependencyVersions.cs" Language="cs" />
    </Task>
  </UsingTask>

  <Target Name="ValidateMSBuildPackageDependencyVersions" BeforeTargets="AfterBuild" Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
    <ValidateMSBuildPackageDependencyVersions AppConfig="@(AppConfigWithTargetPath)" AssemblyPath="$(OutputPath)" />
  </Target>

it does not work because the taskfactory resolves the Code file ValidateMSBuildPackageDependencyVersions.cs relatively to -mt process instead of relatively to the project file which defines it.

Steps to Reproduce

build with -mt mode in MSBuild AR-May@16b9c4d

Expected Behavior

it compiles the file resolved relatively to the project file where it's used

Actual Behavior

it resolves the file with cwd of multithreaded process, which is different than the file path

crash in the taskfactory initialization when it does not find the file

Analysis

No response

Versions & Configurations

No response