How to use InterfaceInterceptor with NServiceBus UnityBuilder

Question

I have a MessageHandler with a dependency declared as:

public IRepository<Person> PersonRepository {get;set;}

I set up my Unity container with:

IUnityContainer container = new UnityContainer();
container.AddNewExtension<Interception>();

container.RegisterType(typeof(IRepository<Person>), typeof(Example.Data.InMemory.Repository<Person>));
container.Configure<Interception>()
    .AddPolicy("PersonAddAdvice")
    .AddMatchingRule(new AddMatchingRule())
    .AddCallHandler(new PersonAddedEventPublishingCallHandler());
container.Configure<Interception>()
    .SetInterceptorFor<IRepository<Person>>(new InterfaceInterceptor());

Then I Init my endpoint with:

class EndpointConfig : IConfigureThisEndpoint, AsA_Publisher, IWantCustomInitialization
{
    public void Init()
    {

        NServiceBus.Configure.With()
            .Log4Net()
            .UnityBuilder(ContainerConfig.LoadContainer())
            .XmlSerializer();

    }
}

(ContainerConfig.LoadContainer() returns the pre-configured IUnityContainer)

the problem is that the IRepository dependency in my MessageHandler is not resolved (it's null when handling the messages).

If I remove the interception configuration from the Unity container, and simply do this:

IUnityContainer container = new UnityContainer();
container.RegisterType(typeof(IRepository<Person>), typeof(Example.Data.InMemory.Repository<Person>));

It works as expected, and the MessageHandler has an instance if IRepository resolved.