Well, I haven't examined it scientifically, but I believe it goes like this:
Coasting in neutral to a stop, foot stays on the brake. When the light is set to change, I move the shift handle back to D and take the foot off the brake, moving to the accelerator pedal. Giving it the gas, I find that the transmission is actually still in neutral.
I think that if I shift back into D before applying the brake to come to a complete stop, it will accelerate normally. It's just when I leave it in N all the way up to and through the stop that it surprises me.