Description:
The issue comes from the digestion having very similar recipes: 1 higher niter + gold > 4 lower niter, and 4 lower niter + gold > 1 higher niter.

I was trying to exalt 4 common into 1 rare metal niter, but the digestion vat kept consuming the gold and 1 common, downgrading it into 4 abundant metal niters.

To Reproduce
Steps to reproduce the behavior:

1. Shove 4 common metal niters, 1 bucket of salt ammoniac, and 1 purified gold into digestion vat. Close it with shift + right click
2. After the necessary time, the vat opens. Take your result and see that it always downgrades (in my case after ~5 tries there never has been an upgrade.

Expected behavior
Nothing strange, really. There is a recipe conflict and the game picks the first one it finds.

Screenshots

System (please complete the following information):

• Theurgy Version: 1.14.1
• OS: Win 10
• Minecraft Version: 1.20.1
• Modpack Link and Version, or list of mods:

Thank you, that is a great find!

I need to update the recipes to work more like shapeless recipes - meaning, they should not allow additional ingredients remaining.

EDIT: I just realized that hat of course is not sufficient as long as the base ingredients stay the same. Will adjust!