AutoLOD breaks the asset importer when creating a scene via C#

neitron commented 2 years ago

I'm trying to create and save a new scene via EditorSceneManager.SaveScene. When the new scene is created and imported it doesn't appear in the Project panel but is visible in the file system. AssetDatabase.Refresh didn't help. I've spent a whole day debugging my code and surfing the project without any success. Only this line of code is an issue EditorSceneManager.SaveScene which is unity API. Then I wasted even more time looking for any related unity bugs. No results. I was so frustrated so I've decided to create an empty project and test it there. And it worked. So the next idea was to import all the packages one by one to see if any of them may cause the issue. And AutoLOD did. To be sure I've created another empty project with AutoLOD added only and reproduced the bug. I also tried to disable all the AutoLOD automatic options in the preferences which didn't help to solve the issue.

I'm working in Unity 2020.3.14f1 running on MBP Retina 2015 (Intel i7) with macOS BigSur 11.2.1.

Steps to reproduce:

Create a new project (unity 2020.3.14f1)
Import AutoLOD package

Create a new editor folder with a new c# script in it


using System.IO;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;

public class TestWindow : EditorWindow { [MenuItem("Test/SceneCreator")] private static void Init() { var window = (TestWindow)EditorWindow.GetWindow(typeof(TestWindow)); window.Show(); }

private void OnGUI()
{
    if (GUILayout.Button("Create and Save"))
        TestNewSceneCreateAndSave();
}

private void TestNewSceneCreateAndSave()
{
    var sceneName = "TestScene";
    var path = Path.Combine("Assets", "Scenes", $"{sceneName}.unity");

    var scene = EditorSceneManager.NewScene(NewSceneSetup.EmptyScene, NewSceneMode.Additive);

    if (AssetDatabase.DeleteAsset(path))
        Debug.Log($"A scene with the same name has been removed. Path: {path}");

    if (EditorSceneManager.SaveScene(scene, path, true))
    {
        Debug.Log($"A new scene has been created. Path: {path}");
    }
}

}


- Open the test window 'Test -> SceneCreator'
- Hit the button 'Create and Save'
- Try to reimport any file in the project, its icon will disappear

In case you do not reproduce it for the first time, remove a new generated scene from the hierarchy and hit the button again. repeat a few times and the asset importer will get broken. You will notice it when a new generated and saved scene will not appear in the scene folder in the Project panel. 

The editor log will spam an infinite amount of messages:
![Clipboard - November 24, 2021 6_03 PM](https://user-images.githubusercontent.com/10614636/143319887-a2a8dc05-9904-4faf-9ee0-90454a77f233.png)

And non responding process is appearing:
![Clipboard - November 24, 2021 6_12 PM](https://user-images.githubusercontent.com/10614636/143321285-cfb4a7c5-fa3c-4592-af12-146ac6ecc637.png)