Removes Permission?

yes exactly... as @Anke already was assuming...
somehow these lines are removed while building the project...

@UsesServices(services = {
  @ServiceElement(
	name = "com.puravidaapps.TaifunNotificationListener.TaifunNotificationListener$NotificationService", 
    label = "NotificationService", 
    permission = "android.permission.BIND_NOTIFICATION_LISTENER_SERVICE", 
    intentFilters = {
      @IntentFilterElement(actionElements = {@ActionElement(name = "android.service.notification.NotificationListenerService")
    })
  })      
})

the MIT App Inventor team will have to find out, why that happens and fix that issue...
as already mentioned

Taifun