Every Time i click Play my Wheels disappear!

Well the problem is that every time when i click play my wheels from a car disappear (as you can see in the screenshots) from some reason and i don't know what is the problem. I checked everything a lot of times and i cannot figure out what is the problem.

This is the script that i am using.

   public class Car : MonoBehaviour
 {
     public WheelCollider wheelColliderLeftFront;
     public WheelCollider wheelColliderRightFront;
     public WheelCollider wheelColliderLeftBack;
     public WheelCollider wheelColliderRightBack;
 
     public Transform wheelLeftFront;
     public Transform wheelRightFront;
     public Transform wheelLeftBack;
     public Transform wheelRightBack;
 
     public float motorTorque = 100f;
     public float maxSteer = 20f; 
     
     void FixedUpdate()
     {
         wheelColliderLeftBack.motorTorque = Input.GetAxis("Vertical") * motorTorque;
         wheelColliderRightBack.motorTorque = Input.GetAxis("Vertical") * motorTorque;
         wheelColliderLeftFront.steerAngle = Input.GetAxis("Horizontal") * maxSteer;
         wheelColliderRightFront.steerAngle = Input.GetAxis("Horizontal") * maxSteer;
     }
     void Update()
     {
         var pos = Vector3.zero;
         var rot = Quaternion.identity;
 
         wheelColliderLeftFront.GetWorldPose(out pos, out rot);
         wheelLeftFront.position = pos;
         wheelLeftFront.rotation = rot;
 
         wheelColliderRightFront.GetWorldPose(out pos, out rot);
         wheelRightFront.position = pos;
         wheelRightFront.rotation = rot * Quaternion.Euler(0,180,0);
 
         wheelColliderLeftBack.GetWorldPose(out pos, out rot);
         wheelLeftBack.position = pos;
         wheelLeftBack.rotation = rot;
 
         wheelColliderRightBack.GetWorldPose(out pos, out rot);
         wheelRightBack.position = pos;
         wheelRightBack.rotation = rot * Quaternion.Euler(0, 180, 0);
 
     }
     
 }