Way too much movement momentum/keys working improperly

Put the summary of the bug you're having here
After moving around for some time and then releasing the keys to stop, the player continues to move for some time, as if those keys weren't actually released.
What I expected to happen was...:
Describe what you thought should happen here
When someone lets go of movement and jump keys, the player should stop moving and jumping.
What actually happened was...:
Describe what happened here
The player continues to move and jump for a time seemingly proportional to the time spent moving.
Steps to Reproduce:
1. Load up a new world in the recent snapshot.
2. Start sprinting and jumping (hold down the keys) for about 5-10 seconds.
3. Release the keys and watch as your player continues to move about.