Drawbridges create a new fake player everytime they are placed, this causes problem mainly with chunk protection because you have to ally the new fake player every time you add a drawbridge and there is no way to know which one is the one you just placed. It should be possible to make all machine use the same fake player (Mekanism, QuarryPlus and TheClickMachine do it).

I just noticed they also seem to change fake players on server restart (without removing the old one from the list as well) which makes the problem even worse having the ally them after the restarts as well.