Version: 1.21
Hello, a friend and I started a server, and I added this mod after he zombified some villagers. I'm not receiving the discounts, but I read in the comments that it does apply to already discounted villagers.
Edit: The only mods we have are this, Fabric Api, and Fabric Language Kotlin. It's also not a realms server, it's a server through Mojang. Attached below are my client side mods.