Text in the scene is not being updated!

Hi, I am new with unity and I am still learning. Basically I am trying to make a quiz game with the questions in the firebase database. With this script I am bringing the data as a snapshot, changing the value to a string and then setting it to a string text. and then setting this string to text in the scene(I think I am good till here) But when I run the game, in inspector question text is set to data from firebase but in the game scene, nothing changes. As my search, this was a bug and it is solved but I am having it still with 2019.2.17f1. Can someone help to fix or workaround this problem?

Here is script;

 using Firebase;
 using Firebase.Database;
 using Firebase.Unity.Editor;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class DatabaseFire : MonoBehaviour
 {
     
     void Start()
     {
         Text questionText = GameObject.Find("Canvas/GamePanel/QuestionPanel/Question").GetComponent<Text>();
 
         // Set this before calling into the realtime database.
         FirebaseApp.DefaultInstance.SetEditorDatabaseUrl("blabla.firebaseio.com/");
 
         // Get the root reference location of the database.
         DatabaseReference reference = FirebaseDatabase.DefaultInstance.RootReference;
 
         FirebaseDatabase.DefaultInstance
             .GetReference("TR")
             .Child("TR")
             .Child("question")
             .GetValueAsync()
             .ContinueWith(task =>
             {
                 if (task.IsFaulted)
                 {
                     // Handle the error...
                 }
                 else if (task.IsCompleted)
                 {
                     DataSnapshot snapshot = task.Result;
                     string dtext = snapshot.Value.ToString();
 
                     questionText.text = dtext;
                     
                     Debug.Log(dtext);                  
                  }
             });
         
     }
 }

thank you.