I had two damaged bows, and wanted to combine them to create a less damaged one.
However when i did so, it created a new bow (Which I expected), but I when I clicked on the new bow, the bows were not gone from the crafting square, and so I was able to keep on creating new bows.
Duplicate of MC-46715 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.