When creating things with the Ritual of The Ballad of Alchemy, The ritual will move items from an input chest to the alchemy set without respecting the NBT data on the items. For example, when creating alchemy items and the alchemy set has one of each required item, adding an item of the same type and one in the alchemy set, but with different NBT data(named), it ignores the NBT data and stacks the named item with the normal item. (used version 1.0.0g with forge 1.7.2-10.12.2.1124)

After doing some more testing, the ritual seems to always remove NBT data, no matter what is already in the alchemy set.

Found the problem in code. It doesn't check the NBT ever. Working on a PR

Working individually on this. I'll close the issue when one of us finishes :P

Go right ahead. btw, you might also want to make the output slot of the alchemy set so it can't have items put into it. If there is an item that stacks and has NBT data in the output chest and you put the same item (w/o NBT) in the output of the ritual, you get a stack of items with the NBT data (may have used this in Agrarian Skies with the books with enchantments given in reward bags to dupe them... xD)