Why can't i move after switching scene

I am having this very bizarre issue when loading a scene. I am building a game that has multiple levels and i need a way to switch between them. I have a script that loads the scene but after the my player controler stops working and i cant move this is the scene switching code using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;

 public class finish : MonoBehaviour
 {
     
     bool done = false; 
       
     private void OnTriggerEnter(Collider other) {
         if (other.gameObject.layer == 7 && done == false) {
             done = true;
             SceneManager.LoadSceneAsync(SceneManager.GetActiveScene().buildIndex + 1);
         }
     }
 }