Query.Include(key) does not fetch related object

[phath9]

I'm making a Live Query subscription when a new message is created. Problem is parseQuery.include("sender") is not working as intended. Therefore, print(sender.getString("username")!!) fires an error because username field does not exist.

        val parseQuery = ParseQuery.getQuery<ParseObject>("messages")
        parseQuery.include("sender")

        val subscriptionHandling: SubscriptionHandling<ParseObject> = app.parseLiveQueryClient!!.subscribe(parseQuery)
        subscriptionHandling.handleEvent(SubscriptionHandling.Event.CREATE) { query, `object` ->
            val handler = Handler(Looper.getMainLooper())
            handler.post {
                val message = `object` as ParseObject
                val sender = `object`.getParseObject("sender") as ParseUser
                print(sender.getString("username")!!)
            }
        }

My Messages class has 'sender' as a Pointer to _User's objectId.