Tried to repair sun's grace using a diamond. Anvil accepts the diamond as an item for repair and assigns a number of levels to repair it but does not increase the durability of the weapon.

Steps to reproduce.
Put a used sun's grace on an anvil with a diamond
Pickup repaired sun's grace

Expected behavior
Full repair

Actual behavior
Durability is the same but levels were spent in repair.

OS Windows
Curseforge launcher
Mod Version 4.2.5
Modpack: DarkRPG Fabric V2.2

I'll take a look at this in the morning, for sure! Thanks for catching this

Thanks!

There is no issue repairing on my end. A single diamond repairs 390 durability here. Therefore, this is a mod conflict. Please bring this up with the GamerPotion, who is the dev of your modpack as this is something that is on their end.