Milking a Cow With a Stack of Buckets Fills All Buckets At Once

When you have a stack of empty buckets(2-16) milking a cow with that stack of buckets in hand will fill the whole stack at once, rather than fill one bucket and leave the others in the stack empty, until you fill them seperately. Makes filling many buckets waaaay quicker than it should be. It may be a good thing, but seems too cheaty and I don't like cheating.