[MC-72492] Villager trading can give stacks of milk buckets

If you trade for a stack of milk buckets with a villager. You can shift-click a stack of milk buckets into your inventory.

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And where do you see a bug here ?

(Kumasasa) Filled buckets aren't supposed to stack.

This works probably as intended because you caused this bug 🙂
For example you can also use this

/replaceitem block ~ ~-1 ~ slot.container.1 milk_bucket 64

To get a stack of milk buckets in a container 🙂
Both can not be achieved without using commands and is not caused by the game itself

Filled buckets aren't supposed to stack.

Sure, didn't see that.

But, as @unknown already stated, this is caused by you since you set up a custom villager with already 3 buckets stacked.