The dishwasher does not wish to dispense all of its detergent if anything is between it and the water. This includes plates perpendicular to it, or any Pyrex below it. It must live freeeeeeeeeee.
This results in tiny bits of detergent on those things, and potentially elsewhere.
So I'm quick washing a load with the remaining detergent after pulling a plate out, hand-rinsing it, and rearranging what was left.
Whee. I did hand-wash enough of them to make coffee, lol.