Question Copying a Tilemap with Script

My goal I have written it here:
https://forum.unity.com/threads/a-2d-platformer-map-to-be-repeating-and-having-no-borders.1501334/

I want to copy a Tilemap with script and set the clone on the right side, but when I do this, there is only one single Tile duplicated but not the whole Tilemap.

My Code is:

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using static UnityEngine.UI.Image;
6. using UnityEngine.UIElements;
7. using UnityEngine.Tilemaps;
8.  
9. public class GroundTilemapScript : MonoBehaviour
10. {
11.     public GameObject tileMapGameobjectOrigin;
12.     protected GameObject tileMapGameobject;
13.     protected Tilemap tileMapComponent;
14.     protected Tilemap tileMapClone;
15.     protected Vector2 tileMapPosition;
16.     protected bool hasDone = false;
17.  
18.     // Start is called before the first frame update
19.     void Start()
20.     {
21.         if(!hasDone)
22.         {
23.             tileMapComponent = tileMapGameobjectOrigin.GetComponent<Tilemap>();
24.             tileMapClone = Instantiate(tileMapComponent);
25.            
26.             tileMapPosition = (Vector2)tileMapClone.transform.position + (Vector2.right * 41);
27.             tileMapClone.transform.position = tileMapPosition;
28.             hasDone = true;
29.         }
30.     }
31. }
32.  

 

I wrote it here because it's a scripting problem, maybe coders won't look in the 2D subforum.

 

I got it to work with this line:

Code (CSharp):

1. tileMapClone.transform.SetParent(grid.gameObject.transform);