Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though 🤷
It's also worth seeing if the dishwasher you have heats up the water or if it just pulls hot water from the boiler.
You'll be able to tell by seeing which pipe connected to, if it's connected to cold water then you're okay, you're not American and you can relax.