ILGenerator property not an instance

I'd like to get this:

.property instance class [WorldTool.Core]WorldTool.IInputPort SomePort
{
    .get instance class [WorldTool.Core]WorldTool.IInputPort WorldTool.Core.Tests.SomeOperatorInstance::get_SomePort()
}

But I'm getting this:

.property class class [WorldTool.Core]WorldTool.IInputPort SomePort
{
    .get instance class [WorldTool.Core]WorldTool.IInputPort SomeOperatorInstanceProxy::get_SomePort()
}

Why am I getting ".property class class" and not ".property instance class"? Here's what I'm using to generate it:

private void CreateProperty(TypeBuilder typeBuilder, PropertyInfo propertyInfo)
{
    var propertyBuilder = typeBuilder.DefineProperty(propertyInfo.Name,
                                                        PropertyAttributes.HasDefault,  
                                                        propertyInfo.PropertyType,
                                                        Type.EmptyTypes);

    var methodBuilder = typeBuilder.DefineMethod(GET_PREFIX + propertyInfo.Name,
                                                    MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.NewSlot | MethodAttributes.Virtual | MethodAttributes.Final,
                                                    propertyInfo.PropertyType, 
                                                    Type.EmptyTypes);

    var methodGenerator = methodBuilder.GetILGenerator();
    methodGenerator.DeclareLocal(propertyInfo.PropertyType);
    methodGenerator.Emit(OpCodes.Nop);
    methodGenerator.Emit(OpCodes.Ldarg_0);
    methodGenerator.Emit(OpCodes.Ldstr, propertyInfo.Name);
    methodGenerator.Emit(OpCodes.Call, typeof(IInputPort).IsAssignableFrom(propertyInfo.PropertyType) ? GetNamedInputPort : GetNamedOutputPort);
    methodGenerator.Emit(OpCodes.Stloc_0);

    var targetInstruction = methodGenerator.DefineLabel();
    methodGenerator.Emit(OpCodes.Br_S, targetInstruction);

    methodGenerator.MarkLabel(targetInstruction);
    methodGenerator.Emit(OpCodes.Ldloc_0);

    methodGenerator.Emit(OpCodes.Ret);

    propertyBuilder.SetGetMethod(methodBuilder);
}