EVALUATION

The problem is that syncNativeQueue() doesn't fully sync the queue. For example, if there are, say, 25 events in the native queue waiting to be processed, nativeSyncQueue could return after just one event has been processed. realSync() calls syncNativeQueue() in a loop until nativeSyncQueue() reports that no native events have been processed as the result of the call or the maximum number of iterations (which is 20) has been exceeded (which leads to the exception). And since there are more than 20 events in the native queue, we get the exception.