Animation not rendered when object is close to one another

Hi guys, first thing first. I have this code:

 using UnityEngine;
 using System.Collections;
 
 public class SpawnActor : MonoBehaviour {
     
     public GameObject actorPrefab;
     
     private float spawnTime = 0.5f; //0.5 secs to spawn each
     private float spawnCounter = 0.0f;
     private int actorCounter = 0;
     
     
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         spawnCounter += Time.deltaTime;
         
         if (spawnCounter > spawnTime)
         {
             spawnCounter -= spawnTime;
             
             Spawn ();
         }
     }
     
     void Spawn()
     {
         GameObject actor = (GameObject) Instantiate(actorPrefab);
         
         actor.name = actor.name + "_" + (++actorCounter).ToString("D3");
         actor.transform.position = Vector3.zero;
         actor.transform.rotation = Quaternion.identity;
         
         actor.animation.Play("Take 001");
         
         StartCoroutine(DeletionCoroutine(actor, actor.animation["Take 001"].length));
     }
     
     IEnumerator DeletionCoroutine(GameObject actor, float time)
     {
         yield return new WaitForSeconds(time);
         
         Debug.Log ("Actor to be deleted: " + actor.name);
         Destroy(actor);
     }
 }

This is just a simple spawning script which will create a gameobject every 0.5 secs, play a pre-determined animation a-la cutscenes (just a simple walking forwards a few steps actually), and then deleted it at the end of the animation.

Now the problem is, every now and then, a few of the objects will be culled and not rendered at all (maybe because the time interval is too short and the objects are close to one another?). The reason I know that it is culled rather than destroyed was because I have this line in the Spawn() function:

actor.name = actor.name + "_" + (++actorCounter).ToString("D3");

And this line in the DeletionCoroutine() function:

Debug.Log ("Actor to be deleted: "+ actor.name);

And the order of the actor was actually correct, so I assume the order of the deletion itself must have been correct also.

Now the question, why did the object not rendered? How do I solve this? BTW, I've tried the "Always Rendered" in the animation's culling type to no avail.

Thanks in advance.

EDIT: I forgot some more info, if that will be useful. The GameObject doesn't have a collider at all. And actuallly I forgot to add one more line in the Spawn() function. It actually has this: actor.animation["Take 001"].speed = 2.0f;. Or in a way, the animation is played at twice the speed.