ScriptableObject : Serialized Polymorphism Classes Can Not be Deserialize with Polymorphism

I make ScriptableObject to use local Database. It includes lists of "Skill". Skills are inherited from SkillBase class. And effect of Skill is written in override method.

Then, I added inherited Skill classes to List , and deserialize it in Game. However, it's effect does not act.

I guess ScriptableObject cannot deserialize with Polymorphism. How shuold I do.

DataTable.cs

  public class DataTable : ScriptableObject
     {
         public List<SkillBase> SkillTable = new List<SkillBase> ();
     }

SkillBase.cs

 [System.Serializable]
 public class SkillBase
 {
     public virtual void SkillExecute ()
     {
         

     }
 }

 [System.Serializable]
 public class Skill1 : SkillBase 
 {
     public override void SkillExecute ()
     {
         

     }
 }

 [System.Serializable]
 public class Skill2 : SkillBase 
 {
     public override void SkillExecute ()
     {
         

     }
 }