Information

Minecraft version: 1.18.1 (latest)
Modloader: Fabric
Fabric loader version: 0.12.12 (latest) / Fabric API version: 0.45.2 (latest)
Environment: Multiplayer (I am hosting the dedicated server myself)

Mod name: Fixed Anvil Repair Cost (Fabric)
Mod version: 1.6 (latest)

Question

Are there any extra set up steps for Fixed Anvil Repair Cost (Fabric)?

Hi,
I have recently decided to install a couple of your mods, namely Fixed Anvil Repair Cost and Tree Harvester.
Both of these require your Collective (Fabric) mod, so I have installed it as well.
Tree Harvester works flawlessly, however, after having installed Fixed Anvil Repair Cost both on server and client, I still see the old increasing repair costs (2 -> 3 -> 5, etc.) instead of a fixed "3" amount as described on Curseforge.
This is not just visual either as when I try to repair my enchanted item (a simple lure II fishing rod), it does consume the indicated levels.

Did I miss any steps to set up the mod (or maybe I have not understood how this mod works?)?
Thank you for any help regarding this issue.