Game Mechanics: Invisibility on giants

[Skaff]

Hello,

I did a quick scan of the forums and I really found nothing on this specific issue. But one thing I noticed was that invisibility worked 100% on sand giants in the oasis. From my previous understanding of the live server, giants from the old world (ice/fire/sand/hill) all saw though invisibility. Though it was only in Kunark when invisibility started to work on giants (only Kunark giants though). It is also worth mentioning that I have only seen sand giants till now and only have tested it against them.