Exception throw in dotnet8 (working in dotnet6)

[p1971]

Describe the Bug

I have a test that asserts that an extension method correctly registers all required dependencies such that clients should have everything fully registered. On dotnet8 this throws an exception. I've included a cut-down example.

Steps to Reproduce

Execute the code below - net6 works - net8 fails

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

  <PropertyGroup>
    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <LangVersion>latest</LangVersion>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.0" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
    <PackageReference Include="Moq" Version="4.20.70" />
    <PackageReference Include="xunit" Version="2.6.4" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

</Project>

public class ExampleOfFailingTest
{
    [Fact]
    public void ServiceProviderShouldResolveTheInterface()
    {    
        IServiceCollection subject = new ServiceCollection();

        // Create a mocked interface
        Mock<ITestInterface<TestClass>> mockInterface = new();

        // add it to the service collection
        subject.TryAddSingleton(typeof(ITestInterface<TestClass>), mockInterface.Object.GetType());

        // build the service provider
        ServiceProvider serviceProvider = subject.BuildServiceProvider();

        // now get an instance of the service
        Assert.NotNull(serviceProvider.GetService<ITestInterface<TestClass>>());
    }
}

public class TestClass
{
}

public interface ITestInterface<in T>
    where T : class
{
    Task DoSomeWork(T request);
}

Expected Behavior

Should also pass on dotnet8

Exception with Stack Trace

System.InvalidOperationException
Unable to resolve service for type 'Castle.DynamicProxy.IInterceptor[]' while attempting to activate 'Castle.Proxies.ITestInterface`1Proxy'.
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateArgumentCallSites(ServiceIdentifier serviceIdentifier, Type implementationType, CallSiteChain callSiteChain, ParameterInfo[] parameters, Boolean throwIfCallSiteNotFound)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateConstructorCallSite(ResultCache lifetime, ServiceIdentifier serviceIdentifier, Type implementationType, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceDescriptor descriptor, ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain, Int32 slot)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateCallSite(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.GetCallSite(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(ServiceIdentifier serviceIdentifier)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(ServiceIdentifier serviceIdentifier, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T](IServiceProvider provider)
   at MoqTest.ExampleOfFailingTest.ServiceProviderShouldResolveTheInterface() in E:\temp\src\moq\MoqTest\MoqTest\Class1.cs:line 26
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

Version Info

Moq - 4.20.70