,My clone sprite is disapeared.

I wanna do a infinite map but when i put the floor this disapeared, im using GameManager in a prefab, and visual studio 2019.
Here is the code.
The classes is in spanish


This happen when i push play mode
176703-captura-de-pantalla-2021-02-27-085719.png

using System.Collections;

using System.Collections.Generic;

using UnityEngine;
public class GameManager : MonoBehaviour
{
public GameObject Col;
public Renderer Fondo;

void Start()
{
    //Mapa infinito
    for (int i = 0; i < 21; i++)
    {
        Instantiate(Col, new Vector2(-10 +i,-3), Quaternion.identity);
    }
}

void Update()
{
    Fondo.material.mainTextureOffset = Fondo.material.mainTextureOffset + new Vector2(0.15f, 0) * Time.deltaTime;
}

}

,I wanna do a infinite map but when i put the floor this disapeared with the scene
Here is yhe cod, im speak spanish so the class is in spanish.
Is a GameManager

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class GameManager : MonoBehaviour
{

public GameObject Col;

public Renderer Fondo;
void Start()
{
    //Mapa infinito
    for (int i = 0; i < 21; i++)
    {
        Instantiate(Col, new Vector2(-10 +i,-3), Quaternion.identity);
    }
}

void Update()
{
    Fondo.material.mainTextureOffset = Fondo.material.mainTextureOffset + new Vector2(0.15f, 0) * Time.deltaTime;
}

}

,

sorry i think i copy paste the question