Oil generator doesn't generate an exit route

[tomribbens]

When trying to make an oil blueprint, when selecting the exit route option, I simply get blueprints with the track stopping right before the laser turrets, and no gates in the walls on that side.

[demipixel]

Does it never work or sometimes work and sometimes doesn't? I'm under the impression this is an off-by-one error (I presume if it placed one more track it would be crossing the wall and generating the gates).