Ender pearls flash in the inventory upon being used in Creative

In the 15w31a snapshot, it's possible to use ender pearls in Creative mode. But instead of just staying in the inventory, they disappear for a little moment upon being used. For example, if you have one, it will disappear and appear again; if you have 10, they will get 9 for a moment and then come back to 10.

Probably the code for throwing ender pearls in Creative is the same as Survival: it takes the ender pearls from you after you threw them. But then the game realizes you shouldn't have lost the ender pearl and gives it back.

ADDITION: After you throw it, even the item tooltip appears on top of the hotbar, as if the item was being given to you through /give.

Steps to reproduce:
1- Get some ender pearls and make sure you're in Creative mode.
2- Throw some of them.
3- Look closely on your hotbar. You'll be able to see that it disappears for a little moment, as if it was being consumed.