Tiles renders but not exists Unity OnClick2D

I have a problem with deleting tiles on hex. I'm sure that my hex position method is working for my project. I want to create tile which is breakable and changes sprite every specified damage done. Code was tested separately.

void NextTile()
    {
        if (currentTile == tiles.Length-1)
        {
            AddValue();
            DestroyTile();
        }
        else
        {
            float offset = transform.parent.position.y;
            Vector3Int pos = GetHexPosition(transform.position, offset);
            tilemap.SetTile(pos, tiles[currentTile+1]);
            Debug.Log("tile has been set, is it tile here?: " + tilemap.HasTile(GetHexPosition(transform.position, transform.parent.position.y)));
            currentTile++;
        }
    }

    void DestroyTile()
    {
        Vector3Int hexPos = GetHexPosition(transform.position, transform.parent.position.y);
        tilemap.SetTile(hexPos, null);
        Debug.Log("destroy tile ends, is it tile here?: " + tilemap.HasTile(hexPos));
    }

It doesn't matter if i create this tile in script or not. HasTile() returns false after setting it to null, but the tile still exists in game (on paused game i can even delete it manually). GameObject is deleted.

I found a solution for colliders (code below), but i really want to use OnClick2D.

public void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.gameObject.tag == "Player")
        {
            AddScore();
            StartCoroutine("DelayedDestroy");
        }
    }

    void DestroyTile()
    {
        Tilemap tilemap = GetComponentInParent<Tilemap>();
        Vector3Int pos = Vector3Int.FloorToInt(transform.position);
        tilemap.SetTile(pos, null);
    }

    IEnumerator DelayedDestroy()
    {
        yield return new WaitForEndOfFrame();
        Destroy(this.gameObject);
        DestroyTile();

EDIT: I found that this problem is with SetTile() method.

private void OnMouseDown()
    {
        Debug.Log("Clicked");
        tilemap.SetTile(hexPos, null);
    }

This code does not work as well on new project and new tilemap. hexPos is working because I can set other tiles in that place, but for some reason "null" not removing sprite from the tilemap.

EDIT 2: I found solution. For tilemaps in unity there could be more than once tile on same place. When you use brush to make maps it's set Z cord to 0 (or Z pos of tilemap?).