Duplicated library references in 5.151.1

Description

After patching Paket to 5.151.1 (from 5.150.0) resolution behavior changed for some reason for package System.Net.Http - it is now referenced through Paket, even though it should not be.

Repro steps

1. Create .Net Framework 4.6 project.

2. (potentially optional) Make sure, that System.Net.Http is in packet.lock file (as a depedency to something else, for example .NetStandard 2.0. Make sure that System.Net.Http is NOT inside paket.dependencies or paket.reference

3. Reference System.Net.Http through assemblies project reference (reference .net framework library version 4.0.0).

4. run paket.exe install

Expected behavior

Only 1 reference, through <Reference Include="System.Net.Http" /> should be present in *.csproj file - this basically references System.Net.Http 4.0.0 from .Net Framework.

Actual behavior

Reference in expected behavior exists, however, additional one is added from packages in form of:

<Choose>
    <When Condition="$(TargetFrameworkIdentifier) == '.NETFramework' And $(TargetFrameworkVersion) == 'v4.6'">
      <ItemGroup>
        <Reference Include="System.Net.Http">
          <HintPath>..\packages\System.Net.Http\lib\net46\System.Net.Http.dll</HintPath>
          <Private>True</Private>
          <Paket>True</Paket>
        </Reference>
      </ItemGroup>
    </When>
  </Choose>

References version is slightly newer, so compilation fails because 2 libraries with same types are references.

Known workarounds

Downgrade to packet version 5.150.0.

Reproduce the issue with the .NET Framework 4.6 project, the relevant entry in packet.lock, and the existing System.Net.Http project reference, then run paket.exe install. Inspect the generated *.csproj and confirm whether both the framework reference and a Paket reference are present; done means only the expected framework reference remains.