Baked prefabs with Directional-Specular Become much darker after Instantiating

After instantiating baked prefabs, the model becomes much darker.

I have read the post on the top (http://forum.unity3d.com/threads/problems-with-instantiating-baked-prefabs.324514/#post-2240243). And made my demo with the example project provided by Joachim_Ante.

So the demo attached below works in the same flow as his, while the main difference is I use Direcitonal-Specular Lightmap Mode. Both far map and near map are set correctly

Steps to review the bug ( you may need unity 5.2B5) :

1. open the scene called: original scene , take a look at the cubes and sphere.

2. open the scene called: PrefabInstantiateScene, and hit play.

3. take a look at the gameobjects, they are darker than in original scene

 

bump

 

I found that if I bake the scene without Precomputed RealTime GI , the prefab will be same looking after instantiating.

So I guess this problem is caused by precomputed RealTime GI is not saved and reassigned to the new scene.

Is there any method save and reassign precomputed realtime gi by script ?