Duplication glitch with recipe book

In 1.12, Minecraft added a new Crafting recipe book, when you open your inventory on the left in survival mode. With this, you could duplicate blocks, sell them in economy servers, and get to the top in an instant. Here's the bug. Generally, watch the video I attached and look carefully at what I'm doing, when you drop an item, while clicking the crafting recipe book really fast "spamming it" and you keep picking it up and dropping it, you could get more of that item.

VIDEO - WATCH: https://www.youtube.com/watch?v=cnl2gxEUFhE
What you need to perform this:

• Wood planks, about 200 or so. (You don't necessarily need it, it's just what i'm using in this video to explain the duplication, but it does work with any block/recipe.
• An item you're going to dupe.
• Survival mode

This could collapse economy servers. Please watch my video for more, it's very vital.
The link to my video is
https://www.youtube.com/watch?v=cnl2gxEUFhE

Thanks for your time.
~Ostr - I-Network.in server developer.