Bug SceneManagement.EditorSceneManager.sceneClosing

https://docs.unity3d.com/ScriptRefe....EditorSceneManager.SceneClosingCallback.html
API: Callbacks of this type which have been added to the sceneClosing event are called just before a Scene is closed.

When removing/unload a scene from the hierarchy, in my opinion, the scene should exist at this time when call:

SceneManagement.EditorSceneManager.sceneClosing += PreSceneClosing;

But unity comes up with a Error in
PreSceneClosing(...)
var gos = scene.GetRootGameObjects(); // Error: Scene does not exist!

I think it's a bug that also occurs in final release 2019..2.2f1 as well.

Test script can exist anywhere in the project. Load a scene and unload.

Code (CSharp):

1. #if UNITY_EDITOR
2. using UnityEditor;
3. using UnityEditor.SceneManagement;
4. using UnityEngine;
5.  
6. /// <summary>
7. /// Get a Notification if the unity/user starts to remove/save/unload a scene
8. /// </summary>
9. [InitializeOnLoad]
10. public static class EditorSceneManagerNotification {
11.  
12.    static EditorSceneManagerNotification() {
13.  
14.        // https://docs.unity3d.com/ScriptReference/SceneManagement.EditorSceneManager-sceneClosing.html
15.        EditorSceneManager.sceneClosing += PreSceneClosing;
16.    }
17.  
18.    static void PreSceneClosing(UnityEngine.SceneManagement.Scene scene, bool removingScene) {
19.        // What happen here: Before Scene Close: Raise Cube to y=10m for next loading
20.  
21.        // This event is called !!before!! closing an open Scene.
22.        // It ! MUST ! be possibe to change gameobjects before unloading the scene.
23.        
24.        var gos = scene.GetRootGameObjects();  // Wrong Error: ArgumentException: The scene is not loaded.
25.        foreach (var go in gos) {
26.            Transform[] trss = go.GetComponents<Transform>();
27.            foreach (var trs in trss) {
28.                trs.gameObject.transform.position = new Vector3(0, 10, 0);
29.            }
30.        }
31.        
32.        // Save the scene
33.        // On the next Load the cube should have position Y=10.
34.        EditorSceneManager.SaveScene(scene);
35.    }
36. }
37. #endif
38.  
39.  

 

(Case 1179151)