Spawn on trigger

So, I am creating an endless runner game and I should spawn some tiles. I decided to use the trigger enter method.This code snippet goes into the each individual platform script,so I instantiate.

    private void OnTriggerEnter(Collider other)
         {
             if(other.tag == "Player")
             {
                          
                 FindObjectOfType<TileManager>().shouldChange = true;            
                 StartCoroutine(WaitAndChange());
             }
         }
 IEnumerator WaitAndChange()
     {
         yield return new WaitForSeconds(waitFor);
         FindObjectOfType<TileManager>().DeleteTile();
     }

This code snippet goes into the tile manager. Tiles move towards player not vice versa, so illusion of movement is created and everything is optimized

 private void LateUpdate()
     {
         if(gameStartScript.gameStarted && playerController.isAirborn == false)
         {
             //if (gameStartScript.GetFirstTile().GetComponent<RoadStart>().shouldMove == true)
             //{
                 gameStartScript.GetFirstTile().transform.Translate(gameStartScript.GetFirstTile().transform.forward * playerController.speed * Time.deltaTime);
             //}
             foreach (var tile in activeTiles)
             {
                 tile.transform.Translate(tile.transform.forward * playerController.speed * Time.deltaTime);
             }
         }
     }

This code snippet is connected to platform, so when I enter the platform's trigger there is a switch and I tile is created

 if (shouldChange)
         {            
             SpawnTile();
             shouldChange = false;//so i create tile once
             //SpawnTile();           
         }

Tile creation function: I instantiate a random tile from list and attach tile at the end of the last instantiated tile. It works fine if speed is not too high

 GameObject tile = Instantiate(prefabs[Random.Range(0, prefabs.Count)], new Vector3(activeTiles[activeTiles.Count - 1].transform.position.x + xAdditive, gameStartScript.GetFirstTile().transform.position.y, activeTiles[activeTiles.Count - 1].transform.position.z + tileLength), gameStartScript.GetFirstTile().transform.rotation);           

You might wonder: what is the problem?So when I set the player's speed or some time passes (which is actually how fast ground is scrolled) a bit high then tiles don't instantiate. They don't, and player just falls off the grid. What is wrong with these scripts?