Double obsidian fragments from dungeon?

I came into twilight dungeon for fun with one of my characters and I started receiving twice amount of obsidian fragments. I don’t have any buff or anything that would say I should receive more. Apparently this is not permanent update. What is causing this? What is this undocumented feature?

only Deadmines give you x2 frag, same was in WoTLK with Oculus…

Deadmines gives you double the fragment because it’s hated and most people will leave the moment they see that loading screen.

It would be great if they double the amount of fragments in all dungeons. Just as a catch up for alts mostly because we’re in the end phase aiming for pre patch MOP

Great idea for prepatch itself.