Setting tile to null results in an error "Destroying object multiple times"

[round bridge]

Hello everyone. I spent quite a while on this problem and it's starting to bug me out. It's not crashing the game or anything, just a little annoying, but the basic gist of it is that I have a custom tile with associated game object:

public class GrassTile : TileBase
{
    public GameObject tileGameObject;
    public Sprite sprite;

    public override void GetTileData(Vector3Int position, ITilemap tilemap, ref TileData tileData)
    {
        tileData.gameObject = tileGameObject;
        tileData.sprite = sprite;
    }
}

So far so good, and here's the script for the tile object itself:

public class GrassTileObject : MonoBehaviour
{
    private GameObject _objectOnTile;
    private Tilemap _tilemap;

    private void Start()
    {
        _tilemap = FindObjectOfType<Tilemap>();
    }
    public GameObject ObjectOnTile => _objectOnTile;
    public void SetObjectOnTile(GameObject objectOnTile)
    {
        _objectOnTile = objectOnTile;
    }
    private void OnDestroy()
    {    
        _tilemap.SetTile(_tilemap.WorldToCell(transform.position), null);      
    }
}