DrawGizmo attribute render draw depth bug?

I've noticed that when using the DrawGizmo attribute instead of the OnDrawGizmos method, that the gizmo draw order becomes apparently random. Am I doing something wrong here or is this actually a bug?

This works perfectly fine:

 using UnityEngine;
 
 public class OnDrawGizmoTest : MonoBehaviour
 {
     void OnDrawGizmos()
     {
         Gizmos.color = Color.cyan;
         Gizmos.DrawSphere(transform.position, 1);
     }
 }

However, replacing OnDrawGizmo with the script below causes issues:

 using UnityEngine;
 using UnityEditor;
 
 public class MyScriptGizmoDrawer
 {
     [DrawGizmo(GizmoType.NonSelected | GizmoType.InSelectionHierarchy | GizmoType.Pickable)]
     static void DrawGizmoForMyScript(OnDrawGizmoTest scr, GizmoType gizmoType)
     {
         Gizmos.color = Color.cyan;
         Gizmos.DrawSphere(scr.transform.position, 1);
     }
 }