The Bug

If entering a bed while the player is in a minecart (on and off rails), boat (in and out of water) or horse, the player will fall out of bed in the direction of the entity. Whether you fall out or not, is based on the position of the mount from the bed and if there are blocks to fall on to. This is not a visual bug. As placing fire on the block you fall on to, will put you fire and kick you from the bed. Video demonstrating the issue: BedBug.mp4

Steps to Reproduce

• Place down a boat and a bed next to one another.
• Set the time to "night" and enter the boat.
• Now enter the bed and take note as to whether or not players can fall out of beds if entering them from mounts.

Observed Behavior

Players can fall out of beds if entering them from mounts.

Expected Behavior

Players would not be able to fall out of beds if entering them from mounts.