Unloading a loaded Scene when load Async for a Loading Bar

Hey Community,

got a problem about Loading and Unloading Scenes

My approach ist to make a Loading Scene. In this Loading Scene you can load various Levels.

But in my Case i cannot Unload the Level while it isLoading

     public void LoadLevel(string sceneIndex)
     {
         //Stop Old Coroutine
         StopCoroutine("LoadAsynchonously");
         //Reset everything
         ResetLoad();
 
         //Check in what Level we are and if we are loading a Level then we want to Unload the Level
         if (load == "LevelThree" && load != "0" || load == "LevelTwo" && load != "0")
         {
             Debug.Log("Unload " + load);
             if (load == "LevelTwo")
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelTwo.unity");
             }
             else
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelThree.unity");
             }
         }
         else if (load == "LevelThree" && load != "0" || load == "LevelOne" && load != "0")
         {
             Debug.Log("Unload " + load);
             if (load == "LevelOne")
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelOne.unity");
             }
             else
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelThree.unity");
             }
         }
         else if (load == "LevelTwo" && load != "0" || load == "LevelOne" && load != "0")
         {
             Debug.Log("Unload " + load);
             if (load == "LevelOne")
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelOne.unity");
             }
             else
             {
                 SceneManager.UnloadSceneAsync("Scenes/LevelTwo.unity");
             }
         }
         //Set the new Level
         load = sceneIndex;
         //Start Coroutine to load the new Level
         StartCoroutine("LoadAsynchonously", load);
     }
 
     void ResetLoad()
     {
         //Reset everyting in Scene
         loadingScreen.SetActive(false);
         operation = null;
         activateLevelButton.gameObject.SetActive(false);
         slider.value = 0;
         progressText.text = "0%";
     }
 
     IEnumerator LoadAsynchonously(string sceneIndex)
     {
         //Set the Loading Bar and UI Active
         loadingScreen.SetActive(true);
         //Get the Operation
         operation = SceneManager.LoadSceneAsync(sceneIndex);
         //Make the Operation not complete by his Own so User can Decide when to start
         operation.allowSceneActivation = false;
 
         //While Loading it chance the UI
         while (!operation.isDone)
         {
             float progress = Mathf.Clamp01(operation.progress / .9f);
             Debug.Log(progress);
             slider.value = progress;
             progressText.text = progress * 100f + "%";
             if (progress > .9f)
             {
                 activateLevelButton.gameObject.SetActive(true);
 
             }
             //return Null ist finish
             yield return null;
         }
     }
 
     public void ActivateLevel()
     {
         //User can activate the new Level
         operation.allowSceneActivation = true;
     }

So my main problem is when the "User" Decides to load Level One and then he Change his mind and say i want load Level Two, he will Press the Button for Level Two and the System load the Second Level but never finish it and show the Button to Start the Level.

Also the first loaded Scene is still active in the hierarchy.

Here are Pictures:



My first workaround was to make a Back Button and also disable the Panel with the Loading Buttons for Levels.

This prevent the User from loading another Scene Async.

So he need to decide if he want to Play the Level or want go back. In Case he press the Back Button then the whole LoadingScene gets reloaded and he is again able to Choose a Level.

But i want to archive this without reloading the LevelLoading Scene. Someone got an Idea? Thanks for Help and Hints.