Update works with ExecuteInEditMode, while OnUpdate don't works with ExecuteInEditMode

Unity Engine
, ,
1

Why Update works with ExecuteInEditMode, while OnUpdate doesn’t work with ExecuteInEditMode? Or if it works, then tell me what I’m doing wrong.

I want to do something like this but couldn’t do. Kindly check the code

Update works with ExecuteInEditMode

using UnityEngine;
using UnityEngine.UI;

namespace Game.UI
{
    [ExecuteInEditMode()]
    public class TestUIWorks : MonoBehaviour
    {
        public Button button;

        public virtual void Awake()
        {
            OnSkinUI();
        }

        public virtual void OnSkinUI()
        {

        }

        protected virtual void Update()
        {
            if (!Application.isPlaying)
            { // set UI if it is not running in Editor
                OnSkinUI();
            }
        }
    }
}

OnUpdate don’t works with ExecuteInEditMode

using UnityEngine;
using Unity.Entities;
using UnityEngine.UI;

namespace Game.UI
{
    [RequireComponent(typeof(GameObjectEntity))]
    [ExecuteInEditMode()]
    public class TestUI : MonoBehaviour
    {
        public Button button;

        public virtual void Awake()
        {
            OnSkinUI();
        }

        public virtual void OnSkinUI()
        {

        }
    }

    class TestUISystem : ComponentSystem
    { // behaviour
        struct Components
        {
            public TestUI testUIComponent;
        }

        protected override void OnUpdate()
        {
            if (!Application.isPlaying)
            { // set UI if it is not running in Editor
                foreach (var e in GetEntities<Components>())
                    e.testUIComponent.OnSkinUI();
            }
        }
    }
}

Any help regarding this

2

[ExecuteInEditMode] should be applied to the system