If your friend opens crafting table, put items in it, and you grab the items from recipe grid back, the result in your friend's gui doesn't dissapier. That means that your friend can put items in, you grab the items back and he grabs the result item back. Boom! Duplicating. Pls fix that problem :)

here's a video of the bug

fyi I found out I have the same exact bug in my mod, I'll let you know how I solve it

ok @Fuzss yhis is how I fixed it: GT-Reimagined/GT-4-Reimagined@85ec1c4

Fixed in v1.0.4.