Can I use reflection with RealProxy instances?

I'm quite sure I'm missing some constraint or caveat somewhere, but here's my situation. Assume I have a class that I want to have a proxy for, like the following:

public class MyList : MarshalByRefObject, IList<string>
{
    private List<string> innerList;

    public MyList(IEnumerable<string> stringList)
    {
        this.innerList = new List<string>(stringList);
    }

    // IList<string> implementation omitted for brevity.
    // For the sake of this exercise, assume each method
    // implementation merely passes through to the associated
    // method on the innerList member variable.
}

I want to create a proxy for that class, so that I can intercept method calls and perform some processing on the underlying object. Here is my implementation:

public class MyListProxy : RealProxy
{
    private MyList actualList;

    private MyListProxy(Type typeToProxy, IEnumerable<string> stringList)
        : base(typeToProxy)
    {
        this.actualList = new MyList(stringList);
    }

    public static object CreateProxy(IEnumerable<string> stringList)
    {
        MyListProxy listProxy = new MyListProxy(typeof(MyList), stringList);
        object foo =  listProxy.GetTransparentProxy();
        return foo;
    }

    public override IMessage Invoke(IMessage msg)
    {
        IMethodCallMessage callMsg = msg as IMethodCallMessage;
        MethodInfo proxiedMethod = callMsg.MethodBase as MethodInfo;
        return new ReturnMessage(proxiedMethod.Invoke(actualList, callMsg.Args), null, 0, callMsg.LogicalCallContext, callMsg);
    }
}

Finally, I have a class that consumes the proxied class, and I set the value of the MyList member via reflection.

public class ListConsumer
{
    public MyList MyList { get; protected set; }

    public ListConsumer()
    {
        object listProxy = MyListProxy.CreateProxy(new List<string>() { "foo", "bar", "baz", "qux" });
        PropertyInfo myListPropInfo = this.GetType().GetProperty("MyList");
        myListPropInfo.SetValue(this, listProxy);
    }
}

Now, if I try to use reflection to access the proxied object, I run into problems. Here is an example:

class Program
{
    static void Main(string[] args)
    {
        ListConsumer listConsumer = new ListConsumer();

        // These calls merely illustrate that the property can be
        // properly accessed and methods called through the created
        // proxy without issue.
        Console.WriteLine("List contains {0} items", listConsumer.MyList.Count);
        Console.WriteLine("List contents:");
        foreach(string stringValue in listConsumer.MyList)
        {
            Console.WriteLine(stringValue);
        }

        Type listType = listConsumer.MyList.GetType();
        foreach (Type interfaceType in listType.GetInterfaces())
        {
            if (interfaceType.IsGenericType && interfaceType.GetGenericTypeDefinition() == typeof(ICollection<>))
            {
                // Attempting to get the value of the Count property via
                // reflection throws an exception.
                Console.WriteLine("Checking interface {0}", interfaceType.Name);
                System.Reflection.PropertyInfo propInfo = interfaceType.GetProperty("Count");
                int count = (int)propInfo.GetValue(listConsumer.MyList, null);
            }
            else
            {
                Console.WriteLine("Skipping interface {0}", interfaceType.Name);
            }
        }

        Console.ReadLine();
    }
}

Attempting to call GetValue on the Count property via reflection throws the following exception:

An exception of type 'System.Reflection.TargetException' occurred in mscorlib.dll but was not handled in user code

Additional information: Object does not match target type.

When attempting to get the value of the Count property, apparently the framework is calling down into System.Runtime.InteropServices.WindowsRuntime.IVector to call the get_Size method. I'm not understanding how the I'm not able to use reflection on the underlying object of the proxy (the actual list) to make this happen. If I'm not using a proxy of the object, getting the property value works fine via reflection. What am I doing wrong? Can I even do what I'm trying to accomplish?