Button component inside the prefab cannot set to interactable=false

I have a prefab with a button component and other three images like below.

Now I instantiating those buttons using a script. But the interactable function doesn't work.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class PopulateGrid : MonoBehaviour
 {
     public GameObject levelObject;
     
     public Text level_index;
     public Image star1, star2, star3;
 
     public int noToCreate;
     // Start is called before the first frame update
     void Start()
     {
         Populate();
     }
 
     // Update is called once per frame
     void Update()
     {
         
     }
 
     void Populate()
     {
         
         for (int i=1; i< noToCreate; i++)
         {
             GameObject newObject = (GameObject)Instantiate(levelObject, transform);
 
                                
             newObject.GetComponentInChildren<Text>().text = i.ToString();
             GameObject.FindGameObjectWithTag("image1").SetActive(false);
             GameObject.FindGameObjectWithTag("image2").SetActive(false);
             if (i == 5) 
             {
                 Debug.Log("Im here");
                 Debug.Log(newObject.GetComponentInChildren<Button>().interactable);
                 newObject.GetComponentInChildren<Button>().interactable = false;
             }
             
         }
     }
 }

Console Output

What is the wrong I do here?