[BLOCKING LIVE CONTENT] Ladders don't have hitbox for movement.

Release_749880 from 1.2.13.6

Summary: Ladders are not solid, meaning a player can walk through them and can't stand on top of them. They are acting like vines.

Impact: In Stranded in Space there are some ladders you climb that do not have a backing. Instead of climbing the ladders you just walk straight through. This prevents people from accessing certain areas integral to the map.

Repro Steps:
1) setblock ~ ~ ~ ladder 2 to create a ladder
2) try to climb it
3) try to stand on top of it

Observed Results: the player will not notice that the ladder is there and will walk straight through it and not be able to jump on top of it.

Expected Results: The player should run into the ladder and climb it from one direction and unable to walk through it from the other, in addition the player should be able to stand on top of the edge of the ladder. In java, you can stand on top of ladders and climb up them when there is no backing too.

Video: https://youtu.be/w5OArBZNyBk