When trying to use the new auto jump feature to jump up a block while in water, I walked up to the block and the screen started shaking slightly. I know that this is a problem with auto jump because when I turned it off, the problem stopped. This problem occurs when your character's head and/or feel are in water, and it occurs in survival, creative and adventure mode.

What I expected to happen was:
If auto jump is meant to work in water, than I would auto jump up the block.
If auto jump is not meant to work in water, I would walk up to the block and the screen would not shake.

What actually happened was:
I walked up to the block, and the screen started shaking sue to my character slightly moving up and down.

Steps to Reproduce:
1. Make sure auto jump is on.
2. Find or create a body of water.
3. Have a 1-block ledge in the water.
4. Try to walk up to the ledge and notice how the screen wobbles.

My hypothesis is that this is caused by the fact that tapping the space bar normally in water only makes you jump a small fraction of the block, and the auto jump feature triggers the same effect as a normal space bar press. The fact that you are in water causes your character to only jump the height you would jump in water, which does not bring you up the full block. Once you touch the ground again, the game detects that you are facing forward right up to the block, and makes you jump. This process repeats rapidly, causing the character's view to shake.