Handles.DrawSolidDisc not working

I'm trying to get handles, specifically Handles.DrawSolidDisc, to display in editor. They weren't showing with my custom script, so I grabbed this example from the docs to test, and it doesn't seem to work either. I attach the script to a gameObject, but no handles are drawn in editor. Tested in 2020.2.0f1 and 2021.1.0f1. They were working on my custom script a few months ago; not sure what might have changed in the meantime. Any ideas?

Mono

Code (CSharp):

1.     using UnityEngine;
2.  
3.     [ExecuteInEditMode]
4.     public class DrawSolidDisc : MonoBehaviour
5.     {
6.         public float shieldArea = 5;
7.     }

Editor

Code (CSharp):

1.     using UnityEngine;
2.     using UnityEditor;
3.  
4.     [CustomEditor( typeof( DrawSolidDisc ) )]
5.     public class DrawSolidDiscEditor : Editor
6.     {
7.         void OnSceneGUI( )
8.         {
9.             DrawSolidDisc t = target as DrawSolidDisc;
10.  
11.             Handles.color = Color.blue;
12.             Handles.Label( t.transform.position + Vector3.up * 2,
13.                                 t.transform.position.ToString( ) + "\nShieldArea: " +
14.                                 t.shieldArea.ToString( ) );
15.  
16.             Handles.BeginGUI( );
17.             GUILayout.BeginArea( new Rect( Screen.width - 100, Screen.height - 80, 90, 50 ) );
18.  
19.             if( GUILayout.Button( "Reset Area" ) )
20.                 t.shieldArea = 5;
21.  
22.             GUILayout.EndArea( );
23.             Handles.EndGUI( );
24.  
25.             Handles.color = new Color( 1, 1, 1, 0.2f );
26.             Handles.DrawSolidDisc( t.transform.position, t.transform.up, t.shieldArea );
27.  
28.             Handles.color = Color.white;
29.             t.shieldArea = Handles.ScaleValueHandle( t.shieldArea,
30.                             t.transform.position + t.transform.forward * t.shieldArea,
31.                             t.transform.rotation, 1, Handles.ConeHandleCap, 1 );
32.         }
33.     }

 

You want to do something like this:

Code (CSharp):

1. private void OnEnable()
2. {
3.     SceneView.duringSceneGui -= SceneGUI;
4.   SceneView.duringSceneGui += SceneGUI;
5. }
6.  
7. private void OnDestroy()
8. {
9.     SceneView.duringSceneGui -= SceneGUI;
10. }
11.  
12. private void SceneGUI(SceneView sv)
13. {
14.     using (new Handles.DrawingScope(Color.blue))
15.     {
16.         Handles.DrawSolidDisc(t.transform.position, mysize);
17.     }
18. }