Help track unknown Unity scene dirty which bloat the version control.

SceneChangeTracker.cs

using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.SceneManagement;

// See https://forum.unity.com/threads/how-to-know-what-makes-scene-dirty.694390

namespace Wappen.Editor
{
    /// <summary>
    /// Editor tool to track live scene change.
    /// </summary>
    public static class SceneChangeTracker
    {
        public static bool TrackSceneChanges = false;

        [MenuItem("Tools/Wappen/Toggle SceneChangeTracker")]
        static void Toggle( )
        {
            if( TrackSceneChanges )
                DisableSceneDirtyChecker( );
            else
                EnableSceneDirtyChecker( );

            EditorUtility.DisplayDialog( nameof(SceneChangeTracker), "SceneChangeTracker is now " + (TrackSceneChanges ? "ON" : "OFF"), "YEE" );
        }

        public static void EnableSceneDirtyChecker( )
        {
            if( !TrackSceneChanges )
            {
                Undo.postprocessModifications += OnPostProcessModifications;
                EditorSceneManager.sceneDirtied += SceneDirtied;
                TrackSceneChanges = true;
            }
        }

        public static void DisableSceneDirtyChecker( )
        {
            if( TrackSceneChanges )
            {
                Undo.postprocessModifications -= OnPostProcessModifications;
                EditorSceneManager.sceneDirtied -= SceneDirtied;
                TrackSceneChanges = false;
            }
        }

        private static void SceneDirtied( Scene scene )
        {
            Debug.Log( $"sceneDirtied on {scene.name}. (See full stacktrace)" );
        }

        public static UndoPropertyModification[] OnPostProcessModifications( UndoPropertyModification[] propertyModifications )
        {
            foreach( UndoPropertyModification mod in propertyModifications )
            {
                Debug.Log( $"Dirty {mod.currentValue.target.name}: {mod.currentValue.propertyPath} to {mod.currentValue.value} from {mod.previousValue.value}", mod.currentValue.target );
            }
            return propertyModifications;
        }
    }
}

Godlike!