You can duplicate items in a grindstone and get infinite xp

When I tried to unenchant a piece of iron leggings I got an unenchanted pair but also the enchanted pair. I was able to duplicate any item that can be enchanted such as books, armor, weapons, tools, and elytra. I was also able to obtain an infinite amount of experience from the grindstone. I hope this bug gets fixed soon. (I also can't wait for the nether update!!!🤩🤩)