Minecraft 18w06a - A weird recipe bug!

I don't know if it is really a bug, but I know someone already discovered it on their PC on Minecraft 1.8.9/1.8.8. This bug version happened to me on Minecraft: Java Version: Snapshot 18w06a. So, I went to /give myself 9 stacks of wood planks, and opened the inventory. I went to try to craft the Crafting Table, but it would not work. (I skipped some un-helpful parts, such as gamemode and setblock) I have collected 8 cobblestone. Then, I opened the crafting table, and try to do the furnace recipe. It worked, but strangely, instead of crafting a furnace, it crafted me an stone. I don't know how it would happen. I am pretty sure I didn't glitch the game by something, because it was my new world. I had to create the screenshots in Paint by myself. That really happen. (When I click on the furnace icon in the Recipe Book it shows me the new Stone recipe).