Bukkit

What steps will reproduce the problem?
1. Going up to a wall
2. Using the Horse TP command and tping a horse so that it teleports partially inside of the wall
3. Riding the horse through the wall

What is the expected output? What do you see instead?
I would expect that the horse not be able to "travel through" the wall, since this is impossible, and also a critical issue for my server. My server is a PvP server, and with this, players can simply "glitch" into other player's towns.

What version of the product are you using?
There is no in game command to view what version of the plugin I'm using, but it's the version shortly before the ability to store horses into a virtual stable.

Do you have an error log of what happened?
No, since the plugin does not recognize it as an error.

Please provide any additional information below.
This is a critical glitch for my server, since players can glitch into other player's bases. We love the idea of this plugin, and hope that we do not have to remove it to get rid of this very large issue.