Failed to resolve assembly PresentationFramework with .Net 8

[Eivind98]

I have a solution with multiple projects which import from the same .csproj file where the difference is the framework changes from net481 to net8.0-windows. I ran into a problem where PresentationFramework doesn't resolve in the net8.0-windows framework but works fine with the net481 framework.

Package Reference:

I found a work around that programmatically finds the missing library path and adds it to LibraryPath:

<!-- Finding the path to PresentationFramework to help ILRepack to resolve dependncies for .net 8-->
<UsingTask TaskName="FindRefPackPath" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
  <ParameterGroup>
    <BasePath ParameterType="System.String" Required="true" />
    <LatestPath Output="true" ParameterType="System.String" />
  </ParameterGroup>
  <Task>
    <Using Namespace="System.IO" />
    <Code Type="Fragment" Language="cs">
      <![CDATA[
    string[] dirs = Directory.GetDirectories(BasePath)
        .Where(d => Path.GetFileName(d).StartsWith("8"))
        .OrderBy(v => v)
        .ToArray();

    if (dirs.Length > 0)
    {
        LatestPath = Path.Combine(dirs[dirs.Length - 1], "ref", "net8.0");
    }
    ]]>
    </Code>
  </Task>
</UsingTask>

<Target Name="ResolveDesktopRefPath" BeforeTargets="Build">
  <FindRefPackPath BasePath="$(ProgramFiles)\dotnet\packs\Microsoft.WindowsDesktop.App.Ref" >
    <Output TaskParameter="LatestPath" PropertyName="NetSdkRefPath" />
  </FindRefPackPath>

  <Message Text="Resolved NetSdkRefPath: $(NetSdkRefPath)" Importance="high" />
</Target>

<Target Name="ILRepacker" AfterTargets="Build">
  <ItemGroup>
    <InputAssemblies Include="$(TargetPath)" />
    <InputAssemblies Include="$(TargetDir)File1.dll" />
    <InputAssemblies Include="$(TargetDir)File2.dll" />
    <InputAssemblies Include="$(TargetDir)File3.dll" />
  </ItemGroup>

  <ILRepack
      Parallel="true"
      Internalize="false"
      InputAssemblies="@(InputAssemblies)"
      TargetKind="Dll"
      OutputFile="$(OutputPath)$(AssemblyName).dll"
      LibraryPath="$(NetSdkRefPath)"
      />
</Target>

This workaround helps, but I wouldn't expect to have to manually resolve the Library path. Shouldn't ILRepack automatically find these references?