Teleportation problem!

I wrote a portal script but whenever i teleport my character it happens to teleport without an arm,how could i connect the body pieces so it teleports completely

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Teleporter : MonoBehaviour
 {
     public Teleporter Other;
 
     private void OnTriggerStay(Collider other)
     {
         float zPos = transform.worldToLocalMatrix.MultiplyPoint3x4(other.transform.position).z;
 
         if (zPos < 0) Teleport(other.transform);
     }
     private void Teleport(Transform obj)
     {   
         //Position
         Vector3 localPos = transform.worldToLocalMatrix.MultiplyPoint3x4(obj.position);
         localPos = new Vector3(-localPos.x, localPos.y, -localPos.z);
         obj.position = Other.transform.localToWorldMatrix.MultiplyPoint3x4(localPos);
 
         //Rotation
         Quaternion difference = Other.transform.rotation * Quaternion.Inverse(transform.rotation * Quaternion.Euler(0, 180, 0));
         obj.rotation = difference * obj.rotation;
     }
 }