can't see items in discovery tab
What are you trying to make? With all four slots empty, are you unable to select mithril ingots? Do you have mithril ingots?
I have Mithril ingot, I can see them in Armorsmith discovery tab
Odd since you should see them for the sigils. Do you have all of them discovered? If not then they either changed something or it is a bug.
If you can’t see an item in the discovery pane, it means you already know every recipe that uses that item learnable through discovery.
If you’re 100% certain there’s a recipe you don’t know that uses Mithril Ingots, and you’re sure that said item is learned through discovery and not a recipe sheet, then its a bug.