HideFlags and CheckConsistency error

Unity Engine
1

I’m trying to create a “preview” object for a custom inspector but I get this error. It happens when I open Unity (with this project) but only if I had this test object selected and hit “save” when Unity asked to save the scene when closing Unity. It also happens if I had the object selected when I hit Play. Is there anything I’m missing here? It seems I must manually destroy the object and that is why I’ve added the code in OnDisable() and OnDestroy() but they don’t seem to be called when I need it.

[edit] I should point out that if I don’t parent the preview object then it is all fine, but I would obvioulsy like it to be moved around with the selected object (therefore the part where I make it a child).

CheckConsistency: Transform child can't be loaded
Error in file: .... Transform.cpp line 1292

This is the code…

using UnityEngine;
using UnityEditor;
using System.Collections;

[CustomEditor(typeof(SpawnPoint))]
public class SpawnPointInspector : InspectorBase<SpawnPoint>
{

    private GameObject preview = null;

    void OnEnable()
    {
        if (preview == null  Target.actorDef != null)
        {
            if (Target.actorDef.art)
            {
                preview = GameObject.Instantiate(Target.actorDef.art) as GameObject;
                preview.transform.parent = Target.transform;
                preview.transform.localPosition = Vector3.zero;
                HideAndDontSave(preview);
            }
        }
    }

    void OnDisable()
    {
        if (preview != null)
        {
            GameObject.DestroyImmediate(preview);
            preview = null;
        }
    }

    void OnDestroy()
    {
        if (preview != null)
        {
            GameObject.DestroyImmediate(preview);
            preview = null;
        }
    }

    private void HideAndDontSave(GameObject go)
    {
        go.tag = "EditorOnly";
        go.hideFlags = HideFlags.HideAndDontSave | HideFlags.HideInInspector | HideFlags.NotEditable;
        if (go.transform.childCount > 0)
        {
            for (int i = 0; i < go.transform.childCount; i++) HideAndDontSave(go.transform.GetChild(i).gameObject);
        }
    }
}

[edit2] I’ve decided to not parent it and just do this, but I would like to know if I where doing something wrong in my code above or missed something or could have done something better.

void OnSceneGUI()
{
    if (preview != null)
    {
        preview.transform.position = Target.transform.position;
    }
}
2

Just a little bump before I give up on this being replied to.

3

I kinda resolved my first issue by not parenting the preview object and also registering a callback on EditorApplication.playmodeStateChanged to check when playmode is activated and then manualyl deleting the game objects.

I now have another problem, when I create a new scene the preview objects, the ones with HideFlags.HideAndDontSave, stays behind o.O