List Serialization In Editor

Just wondering am i only one with this kind of problem or .... and yes its 2020.3.34+ and 2021.x same

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class TestingLists : MonoBehaviour
6. {
7.     [System.Serializable]
8.     public class TempClass
9.     {
10.         public List<int> sampleList;
11.     }
12.     public List<TempClass> magicList = new List<TempClass>();
13. }
14.