Bug EditorWindow repaint no longer works with DragAndDrop.

I have an EditorWindow with wantsMouseMove = true and a Repaint call.
As soon as I drag an object from the Project Window into my window in Unity 3D 2020.2.0f1, this window is no longer redrawn until I release the mouse button. It had worked in the previous version of Unity 3D.
I need the repaint to display an icon under the mouse pointer while dragging.

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3.  
4. namespace PGT.GameDesignStudio
5. {
6.     public class TestWindow : EditorWindow
7.     {
8.         [MenuItem("Window/TestWindow")]
9.         public static TestWindow Init()
10.         {
11.             TestWindow window = EditorWindow.GetWindow<TestWindow>(typeof(SceneView));
12.             window.Show();
13.             window.wantsMouseMove = true;
14.             return window;
15.         }
16.  
17.         public virtual void OnGUI()
18.         {
19.             GUI.Label(new Rect(10f, 10f, 300f, 16f), "MouseMove: " + wantsMouseMove + " Position: " + Event.current.mousePosition);
20.             this.Repaint();
21.         }
22.     }
23. }
24.