〇Condition: Set the spigot.yml item "hopper-amount" to other than 1.

〇Example of prerequisites
・A combination of hopper and chest, each filled with one type of item.

・The same item exists in both the hopper and chest

〇 Phenomenon occurrence condition: Take only half of the item from the chest by right-clicking.

〇Phenomenon: When half of the items taken are sent to the chest, the number of items in the hopper does not decrease and remains the same.
As a result, the number of items obtained will multiply.

〇Expected result: If you get half of the items, the hopper will send you as many items as you got.

〇Note: A similar phenomenon was confirmed with the following versions.

CraftBukkit version 4267-Spigot-5bbef5a-403accd (MC: 1.21) (Implementing API version 1.21-R0.1-SNAPSHOT)
Does not occur with Spigot1.20.4

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