During my little survival on the snapshot 15w40b, afther crafting my shield, a banner, a cauldron and a buchet ... i had tried to put the water, with the bucket,(and the shield on the left arm) from the pond to the cauldron. Aaand the wather disaphear from my hands and the cauldron still void.
I hope you guys can fix that second arm bug.

From TommDX