Navigation Error after reloading the scene

Hi community,
In my model, I have a scene with “Fire fighting” name.
I have set a timer of 120 secs like a countdown. Once after the timer is decremented to 0 then it reloads the scene According to my timer script. After reloading the scene. We are unable to navigate the scene.
I have attached my Timer script. Please check.
How to navigate in scene after reloading the “Fire fighting” scene?
Thanks in advance

 using System.Collections; using
> System.Collections.Generic; using
> UnityEngine; using UnityEngine.UI;
> using System; using
> UnityEngine.SceneManagement;
> 
> public class GameTimer : MonoBehaviour
> {
>     int countDownStartValue = 120;
>     public Text timerUI; 
>     // Start is called before the first frame update
>     void Start()
>     {
>         countDownTimer();
>       
>     }
> 
>     // Update is called once per frame
>     void countDownTimer()
>     {
>         if(countDownStartValue > 0)
>         {
>             TimeSpan spanTime = TimeSpan.FromSeconds(countDownStartValue);
>             timerUI.text = "Timer : "+ spanTime.Minutes +" : "+
> spanTime.Seconds;
>             countDownStartValue--;
>             Invoke("countDownTimer", 1.0f);
>         }
>         else
>         {
>             timerUI.text = "GameOver!";
>             
>             SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
>         }
>     } }

Hi,
Normally the baked navmesh data should be linked to your scene when you load your scene.

Is scene navmesh present after reloading the scene?

could be a broken link ?

maybe report as bug to unity team.