@Jeremy: I've never had a problem either, but I haven't had any crashes at all so this bug hasn't had a chance to show up. However my script above does reproduce the problem - have you tried it?
I installed Jaunty Alpha 4 on February the 6th. I would suppose that this is equivalent to what you've done, since you only get the updates after having installed the system. (Alpha 5 is not out yet, is it?)