[Minecraft 14w06b Crouching First Person Bug]

I was making a Minecraft Mario mechanic as a continuation to the "vine to a cloud" in Minecraft using barrier blocks and command blocks. I shortly descovered that being in first person mode and crouching causes the first person hand to change into a wierd position. I'm not quite sure if this was intended but it was most likely a glitch...
It seems players are crouching rather weirdly too.

HOW I TRIGGERED THE BUG:
1. Spawned a flatgrass map
2. Changed gamemode to Survival
3. Changed gamemode to Creative
4. Pressed +CROUCH (By Default: SHIFT)