Added the Respawn Manager which allows for the use of multiple safe zones. Cleeaned up the code and made more efficient.

game/Assets/RespawnManager.cs

@@ -0,0 +1,23 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class RespawnManager : MonoBehaviour
+{
+    private Vector3 respawnPoint;
+
+    public void setRespawnPoint(Vector3 _respawnPoint)
+    {
+        respawnPoint = _respawnPoint;
+    }
+
+    public Vector3 getRespawnPoint()
+    {
+        return respawnPoint;
+    }
+
+    private void Update()
+    {
+        Debug.Log(respawnPoint);
+    }
+}

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game/Assets/Scenes/Checkpoints.unity

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   animator: {fileID: 597246038}
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game/Assets/Scripts/Checkpoint/SafeZone.cs

@@ -8,39 +8,35 @@ public class SafeZone : MonoBehaviour
     private GameObject player;
     private bool isSafe = false;
 
-    public Vector3 respawnPoint;
+    [SerializeField] private RespawnManager _respawnManager;
-    public Vector3 playerPos;
-    public List<Vector3> lastPlayerPos = new List<Vector3>();
-
-    private void Start()
-    {
-        player = GameObject.Find("Player");
-    }
 
     private void OnTriggerEnter(Collider other)
     {
-        isSafe = true;
+        if (other.gameObject.name == "Player")
+        {
+            isSafe = true;
+            player = other.gameObject;
+        }        
     }
 
     private void OnTriggerExit(Collider other)
     {
-        isSafe = false;
+        if (other.gameObject.name == "Player")
+        {
+            isSafe = false;
+        }
     }
 
     private void FixedUpdate()
     {
-        if (isSafe == true)
+        if (isSafe)
         {
-            playerPos = player.transform.position;
+            SetRespawnPoint(player.transform.position);
-            lastPlayerPos.Add(playerPos);
-
-            respawnPoint = lastPlayerPos.Last();
-            Debug.Log("Player Position: X = " + playerPos.x + " --- Y = " + playerPos.y + " --- Z = " + playerPos.z + " --- RespawnPoint = " + respawnPoint);
         }
     }
 
-    public Vector3 safeSpawn()
+    private void SetRespawnPoint(Vector3 _respawnPoint)
     {
-        return respawnPoint;
+        _respawnManager.setRespawnPoint(_respawnPoint);
     }
 }

game/Assets/Scripts/Death & Respawn/DeathZone.cs

@@ -4,21 +4,18 @@ using UnityEngine;
 
 public class DeathZone : MonoBehaviour
 { 
-    public SafeZone sz;
     public Animator animator;    
-    
     public GameObject fadeScreen;
 
-    [SerializeField] private Transform player;
+    private GameObject player;
-    private bool isDead;
+
+    [SerializeField] private RespawnManager respawnManager;
 
     private void OnTriggerEnter(Collider other)
     {
-        isDead = true;
+        if (other.gameObject.name == "Player")
-
-        if (isDead == true)
         {
-            
+            player = other.gameObject;
             StartCoroutine(respawnPlayer());
         }
     }
@@ -31,11 +28,10 @@ public class DeathZone : MonoBehaviour
         fadeScreen.GetComponent<Animation>().Play("fadeAnim");
         //yield return new WaitForSeconds(0.5f);
 
-        player.transform.position = sz.safeSpawn();
+        player.transform.position = respawnManager.getRespawnPoint();
         yield return new WaitForSeconds(2);
 
         fadeScreen.GetComponent<Animation>().Play("fadeInAnim");
         yield return null;
-        isDead = false;
     }
 }