Item duplication using recipe book by drop an item and spam clicking the recipe book and pick that item up again

Description:

Item can be duplicated by drop the item and spam clicking the recipe book with craftable items in your inventory. When you pick that item back, you will have chance to get a stack of it. This issue was tested in an original server which was downloaded from https://s3.amazonaws.com/Minecraft.Download/versions/1.12/minecraft_server.1.12.jar
and this link was found in the original minecraft launcher.

How to reproduce:

First collect something which can be crafted into another things without crafting table, such as some wooden planks, and we drop something which we want to duplicate, then quickly spam clicking the recipe book until we pick that dropped item back. If it's not duplicated, drop it again and spam clicking the recipe again. Then we got chance to get a stack of that item, which often stacked to 65, or above.

Here is the video:
https://www.youtube.com/watch?v=sdV21tZSWKQ

Here is another video from spigotmc.
https://www.spigotmc.org/resources/recipe-book-dupe-patch.44413/