Bug : GetSiblingIndex always returns zero on scene root game objects in build runtime.

I reported this bug via Unity bug reporter tool long time ago but it was never fixed. I can't find it in issue tracker either.

Bug record:
http://fogbugz.unity3d.com/default.asp?653948_lhpsonb8akqhg7n7

No result in issue tracker:
http://unity3d.com/search?refinement=issues&gq=653948

Bug description:
GetSiblingIndex always returns zero on scene root game objects in build runtime.

It's working good for parented objects.
In editor play mode runtime, it's working perfect...

Bug : GetSiblingIndex always returns zero on scene root game objects in build runtime.