Reinstantiated object seems destroyed

Questions & Answers
1

At the begin of my script, I do:

void InstantiateTargets(int amount)
{
	var i = 0;
	while (i <= amount-1) {
		Instantiate (targetPrefab, new Vector3 (0, -100, 0), Quaternion.identity).name = "target"+i;
		i++;
	}
}

and

void AssignTargets()
{
	targets = GameObject.FindGameObjectsWithTag("target");
    Debug.Log(targets[0]); // comment 1
}

To illustrate my problem, I put this in the Update void:

void Update()
{
     Debug.Log(targets[0]); // comment 2
}

Later on, I destroy all the targets, and AFTER that, I call both voids again. The weird thing is that comment 1 keeps working: it gives me the correct target. But the moment I destroy the targets, comment 2 gives me null, even after I called the voids again to instantiate them again. The targets exists in the hierarchy, but I can’t use them using targets.
Any thoughts what’s going on? What am I doing wrong here? Thanks a bunch!

2

Perhaps something like this:

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

namespace Assets.Scripts
{
    public class DataHandler : MonoBehaviour
    {
        [SerializeField]
        private GameObject targetPrefab;

        public List<GameObject> Targets = new List<GameObject>();

        /// <summary>
        /// Create new targets.
        /// </summary>
        /// <param name="amount"></param>
        public void InstantiateTargets(int amount)
        {
            for (int i=0; i < amount; i++)
            {
                var obj = Instantiate(targetPrefab, new Vector3(0, -100, 0), Quaternion.identity);
                obj.name = "target" + i;

                // Add target to list
                Targets.Add(obj);
            }
        }

        /// <summary>
        /// Destroy one target.
        /// </summary>
        /// <param name="target"></param>
        public void DestroyTarget(GameObject target)
        {
            var instanceId = target.GetInstanceID();
            target = Targets.FirstOrDefault(f => f.GetInstanceID() == instanceId);
            if (target != null)
            {
                Targets.Remove(target);
                Destroy(target);
            }
        }

        /// <summary>
        /// Destroy multiple targets.
        /// </summary>
        /// <param name="targets"></param>
        public void DestroyTargets(IEnumerable<GameObject> targets)
        {
            foreach (var target in targets)
            {
                // Get unique gameobject id
                var instanceId = target.GetInstanceID();
                var targetHolder = Targets.FirstOrDefault(f => f.GetInstanceID() == instanceId);
                if (targetHolder != null)
                {
                    Targets.Remove(targetHolder);
                    Destroy(targetHolder);
                }
            }
        }
    }
}