Camera switch | issue

the player script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class switchdimension : MonoBehaviour {
 
    
     public bool IsIn2D = false;
     public Camera Cam3d;
     public Camera Cam2d;
     
     public Animator anim;
     public Animator anim2;
     
 
     void FixedUpdate()
     {
         if (Input.GetButtonDown("Switch Dimension"))
         {
 
             IsIn2D = !IsIn2D; //invert the state
 
             StartCoroutine(Animation());
             
             
         }
 
     }
 
     IEnumerator Animation()
     {
 
         
         
             
             yield return new WaitForSeconds(0.5f); //wait for the animation
 
             Cam2d.enabled = IsIn2D; //switch cameras ( here's the bug )
             Cam3d.enabled = !IsIn2D;
 
 
 
 
     }
 }

sometime the animation plays ( it's in a other script ) but the IsFlat variable don't change and the cameras don't switch.

Animation script :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class CameraAnim : MonoBehaviour
 {
     public Animator anim;
     public string name;
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetButtonUp("Switch Dimension"))
         {
             
             anim.Play(name);
         }
     }
 }