This is actually for 0.11.1, but that is not listed on the versions.

If a person joins another person's world via LAN, the person who joined will take insanely high and incorrect fall damage. If you are climbing down a vine, you will still take fall damage even though you are climbing down it. Trying to get down an area and take a little fall for a shortcut? Say goodbye to half+ of your health. Keep in mind this is only for the person who joined, and not for the host. Fix this, as it makes multiplayer pretty much unplayable.