Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though 🤷
That may save some time but I don't think it'd save water. Dishwashers don't constantly add new water. Itll add water for a rinse, wash it out, and then more water for the clean. I'm sure some dishwashers do a third cycle as well