Legs and Louie joint task still glitched!

...so I'm out and about all day...I arrive home, collect from my town, then put everyone on one-hour tasks. After doing a small amount of tweaking, Legs comes walking across my screen! I actually said "What the f***?" out loud. Now, after thinking through what I did and some testing, I can say that road building still causes the glitch. Whether there are other things that trigger it as well, I don't know, but I'm certain that building roads will kill the task.

Dammit.