Player can clip through the ground when exiting a minecart or a boat

The bug

When exiting a minecart in a 2 block high space with a ceiling on the third block, the player would be placed a block into the ground if exiting the minecart by quickly tapping the dismount key (shift). This only happens when the cart has derailed, but can happen in all dimensions.

How to reproduce

1. Create a 2 block high room, at least 3x3 from the centre of the cart to remove all other dismount spaces
2. Place a minecart onto track 
3. Break the track beneath the cart or ride the cart off of the track
4. Mount the cart
5. Dismount the cart, this only needs to be done quickly if the dismount key is bound to the same as the "sneak" key [Default: 'Left Shift'] 

Completing this steps will result with the player being placed in the ground.