Anti Tank Ditches and movement?

[Plain Ian]

The Rules say:

"Anti-Tank Ditch Destruction and Bridging Any Engineer unit adjacent to an Anti-Tank Ditch may attempt to destroy it. The process and rules for this are the same as for Bridge Damage. The defense value of an Anti-Tank Ditch used in this process is 1. 

If an Anti-Tank Ditch is destroyed, then it no longer has any effect on movement. 

An Engineer unit capable of building bridges may build a bridge over an AntiTank Ditch. Again, the rules and procedure for this are the same as constructing a bridge over a river."

However that's not what I'm seeing when I try to move over a damaged ditch? Its taking Full movement to cross ditch which means you have to start adjacent? So I assume the game engine is correct and the rules are wrong?