[MC-45261] Sneaking while teleporting changes player position to face -Z

It seems that if you teleport to a position (Using command blocks), your position updates to EXACTLY negative z.

To reproduce:
1. make a command block
2. teleport. While activating, hold shift.
3. There you are, facing -Z

Environment

Windows 8, Java 7

As a quick bit of info to add on, it is if your mouse is COMPLETELY still. Moving it does not cause a problem.

Confirmed, I even get stuck in the block underneath me sometimes

It also happens in 14w04a

Confirmed in 14w04b, the orientation gets set to 0.

this seems to be fixed in 14w06a