Unity Editor: Calling EditorCoroutine from MenuItem

I'm trying to write an Editor script that will load a scene additively, then get every gameobject in that scene and move it a set distance. EditorCoroutineUtility wants me to pass it an instance to run the coroutine on, and MenuItem wants the method to be static.

I tried making a static instance like I do with my Scriptable Objects and running the coroutine on that, but the coroutine wont start as far as I can tell. Here is where I am at, the only Debug message I get is "Calling coroutine"

 public class MapEditor : Editor
 {
     //I dont honestly understand how these two lines are even supposed to work
     //but they do for my scriptable objects
     private static MapEditor instance;
     public static MapEditor Instance { get { return instance; } }
 
     private void OnEnable()
     {
         instance = new MapEditor();
     }
 
     [MenuItem("MapEditor/Display Neighbors")]
     public static void displayNeighbors()
     {
         Debug.Log("Calling coroutine");
         EditorCoroutineUtility.StartCoroutine(loadScene(), Instance);
     }
 
     static IEnumerator loadScene()
     {
         Debug.Log("loading scene");
         yield return EditorSceneManager.LoadSceneAsync("pinkFruitTree", LoadSceneMode.Additive);
         Debug.Log("loaded scene");
         Scene s = EditorSceneManager.GetSceneByName("pinkFruitTree");
 
         GameObject[] gameObjects = s.GetRootGameObjects();
         Debug.Log(gameObjects.Length);
         foreach (GameObject g in gameObjects)
         {
             g.transform.position += Vector3.right * 20;
         }
     }
 }