When placing a door underwater and moving behind it, its hitbox is inconsistent allowing for blocks to be broken and placed behind it randomly. This also works on the front of the door in its opened state.

Steps to reproduce:

1. Place a door underwater
2. Swim behind it and stand on the ground 
3. Try to open the door in various places

Observed Results:

Blocks are placed and broken through door.

Expected Results:

Door should open or break.