Items can get lost when using the Knowledge book

I have only tried this glitch with hoppers. Having 3 stacks of iron ingots in your inventory with the stack of chests, and have the other 2 stacks of iron on the floor. Clicking the hopper recipe in the knowledge book multiple times will make you lose 2 of the 5 stacks of iron. Quiting and reloading the world does not bring the items back/fix it.

LoseItems.mp4