MongoDB Unknown discriminator value

I've added the code in the answer to this question: Unknown discriminator value 'MyEvent', but it didn't help.

An error occurred while deserializing the Body property of class EventStore.EventMessage: Unknown discriminator value : "Insert event name".Error only occurs when you try to rehydrate a saved object after program restart.

Running latest MyGet Build

Sample Repository:https://github.com/tonyeung/EventStore-MongoDB

To replicate the issue:

run the program
press c to create a new record
press q to quit
run the program again
but press r to rehydrate
error triggers

If you run the program, press c, press enter to continue, and press r to rehydrate without quitting, the object is rehydrated without a problem. WAT?

        using (var eventStore = WireupEventStore())        {            var snapshot = eventStore.Advanced.GetSnapshot(ID, int.MaxValue);            if (snapshot == null)            {                // ERRORS HERE                using (var stream = eventStore.OpenStream(ID, 0, int.MaxValue))                {                    var events = from s in stream.CommittedEvents                                 select s.Body as IEvent;                    obj.LoadsFromHistory(events);                }            }        }

github issue: https://github.com/NEventStore/NEventStore/issues/203