Loading Bar don't work (Sprite Packer)

Unity Engine
1

Hello, right now on my game when i load other scene i get a bar which show progress, all work fine. But when i had use Sprite Packer (to pack sprites) the bar don’t show any progress, just stay in one place.

Loading code: (the code work fine, but after adding Sprite Packer, bar don’t show any progress).

   public   void ClickAsync(string level)
    {
        loadingImage.SetActive(true);
        StartCoroutine(LoadLevelWithBar(level));
    }


    IEnumerator LoadLevelWithBar (string level)
    {
        async = SceneManager.LoadSceneAsync(level);
        while (!async.isDone)
        {
            loadingBar.value = async.progress;
            yield return null;
        }

Also if I understand good, One scene - one Packing tag, also should i use Unity Sprite Packing? Also after Packing the game will run faster? Android Game

2

Ref
Any1 could Help me ?