DontDestroyOnContact.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DontDestroyOnContact : MonoBehaviour
{
    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Bullet"))
        {
            return; //makes sure the bullet doesn't destroy other bullets
        }

        if (other.CompareTag("Tilemap"))
        {
            Destroy(gameObject); //destroys the bullet if it hits any part of the tilemap
        }


    }
}