1. If Embers' ores are not registered at startup, the Ancient Codex's tab for Ores will be empty. Here's how that looks in-game!
   
2. The Ancient Codex has a strange empty tab with no localization value (if it helps, I'm using the extended-life Soot and Aetherworks versions):
   

Thank you for pointing both of these things out. I'll try to get them sorted out soon. :)

Fun fact the "test" category was added by Embers Construct, so I had to do some research to find which mod added it. :)