Modify Prefab Asset in OnValidate

Hi, I'm trying to automatically assign a value to a field on a component that resides in a prefab in script and save that prefab modification in OnValidate.

Here is my script:

  [SerializeField] MyComponent myComponent;
  void OnValidate()
  {
      if (myComponent != null)
      {
          myComponent.myScriptableObject = this;
          PrefabUtility.RecordPrefabInstancePropertyModifications(myComponent.myScriptableObject); 
 //At this point, myComponent.myScriptableObject shows the correct value
          PrefabUtility.SavePrefabAsset(myComponent.gameObject, out bool success);
 //Now myComponent.myScriptableObject is reset to null
      }
  }

Unfortunately, this script doesn't work. For some reason the value is not actually applied to the prefab. What am I missing here?

Also, calling SavePrefabAsset() in Onvalidate gives me the following error in console :

 Destroying GameObjects immediately is not permitted during physics trigger/contact, animation event callbacks or OnValidate. You must use Destroy instead.
 UnityEditor.PrefabUtility:SavePrefabAsset(GameObject, Boolean&) (at ?)
 ResearchTree.Data.ResearchItem:OnValidate() 

Is this related in any way?