EventStore metadata issue

example.cs

public void CatchUpSubscription(
	string streamName,
	int lastSeenIndex,
	Action<EventInfo, int> processAction)
{
	_processAction = processAction;

	int? startIndex = lastSeenIndex;
	if (lastSeenIndex == -2)
		startIndex = null;

	Logger.Debug($"Subscribing to {streamName} as catch-up subscription at index {lastSeenIndex}...", this);
	var settings = new CatchUpSubscriptionSettings(10000, 100, false, true);
	var sub = _eventStore.SubscribeToStreamFrom(
		streamName,
		startIndex,
		settings,
		EventAppeared);

	_disposableCollection.Add(() => sub.Stop());
}

private void EventAppeared(EventStoreCatchUpSubscription eventStoreCatchUpSubscription, ResolvedEvent resolvedEvent)
{
	EventAppeared(resolvedEvent);
}

private void EventAppeared(ResolvedEvent resolvedEvent)
{
	if (_processAction == null)
		throw new InvalidOperationException("The process action was not set.");
	
	try
	{
		Logger.Debug($"EVENT READ: {resolvedEvent.Event.EventType} ({resolvedEvent.Event.EventStreamId})", this);

		// fails below because I'm not expecting $metadata
		
		EventInfo info;
		if (!_deserializationFactory.TryDeserialize(resolvedEvent.Event.Data, resolvedEvent.Event.Metadata, out info))
		{
			Process(info, resolvedEvent.OriginalEventNumber);
			return;
		}

		Logger.Error($"Could not deserialize event {resolvedEvent.Event.EventType}.", this);
	}
	catch (Exception ex)
	{
		Logger.Fatal($"Could not deserialize event. {ex.Message}", this, ex);
	}
}