Issue with destroying tiles

I am currently making a script for a bullet gameobject that destroys tiles. The script that I use for the bullet and the tile are both below, as is a recording of what happens when I run it. Why don't any of the tiles get removed? I don't get any errors either.

Script for the bullet:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Tilemaps;
 public class BulletDirectionController : MonoBehaviour {
     Tilemap tilemap;
     Rigidbody2D rig;
     int bounces;
     // Use t$$anonymous$$s for initialization
     void Start () {
         rig = GetComponent<Rigidbody2D>();
         tilemap = GameObject.Find("Grid/Default").GetComponent<Tilemap>();
     }
     
     // Update is called once per frame
     void Update () {
         transform.rotation = Quaternion.RotateTowards(transform.rotation, Quaternion.Euler(new Vector3(0, 0, Mathf.Atan2(rig.velocity.y, rig.velocity.x) * Mathf.Rad2Deg)), 10);
     }
 
     private void OnCollisionEnter2D(Collision2D collision)
     {
         bounces += 1;
         if (bounces > 5) {
             TileBase tile = tilemap.GetTile(tilemap.WorldToCell(collision.transform.position)); //Gets tile landed on
             if (tile is DestructableTile) {
                 ((DestructableTile)tile).Explode(2); //Explodes with a power of two
             }
             Destroy(gameObject); //Destroys bullet
         }
     }
 }

Script for the tile:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEditor;
 using UnityEngine;
 using UnityEngine.Tilemaps;
 [CreateAssetMenu]
 public class DestructableTile : TileBase {
     public bool Destructing = false;
     public Tile.ColliderType ColliderType = Tile.ColliderType.Sprite;
     public Sprite m_Sprite;
 
     GameObject gameObject;
     Vector3Int _position;
     Tilemap _tilemap;
     TileData data;
 
     public override bool StartUp(Vector3Int position, ITilemap tilemap, GameObject go)
     {
         _tilemap = GameObject.Find("Grid/Default").GetComponent<Tilemap>();
         gameObject = go;
         return base.StartUp(position, tilemap, go);
     }
 
     public override void GetTileData(Vector3Int position, ITilemap tilemap, ref TileData tileData)
     {
         data = tileData;
         tileData.colliderType = ColliderType;
         tileData.sprite = m_Sprite;
         base.GetTileData(position, tilemap, ref tileData);
 
         _position = position;
 
     }

     public void Explode(int power) {
         if (power <= 0 || Destructing) { //Return if explosion has reached 0 power or is already destructing
             return;
         }
         Destructing = true;
         List<TileBase> tiles = new List<TileBase>();
         for (int x = -1; x <= 1; x += 2) { //Finds tiles left and right of t$$anonymous$$s one
             TileBase temp = _tilemap.GetTile(_position + new Vector3Int(x, 0, 0));
             if (temp != null) {
                 tiles.Add(temp);
             }
 
         }
 
         for (int y = -1; y <= 1; y += 2) { //Finds tiles up and down from t$$anonymous$$s one
             TileBase temp = _tilemap.GetTile(_position + new Vector3Int(0, y, 0));
             if (temp != null) {
                 tiles.Add(temp);
             }
         }
         foreach (TileBase tile in tiles) {
             if (tile is DestructableTile) //Determine if tile we found is a DestructableTile
             {
                 DestructableTile dTile = (DestructableTile)tile;
                 dTile.Explode(power - 1);
             }
         }
         _tilemap.SetTile(_position, null);
         _tilemap.RefreshTile(_position);
     }
 }

Here is what happens: https://streamable.com/974ax

Can someone please explain what I am doing wrong?