I've added new recipes for charms, but the mod simply won't load them. If the recipes are moved to another mod's recipes, they load correctly, but the original charms recipes are not replaced.

It looks like the original recipes are going to have to be removed using crafttweaker, and the new recipes are going to have to be moved into a different mod's recipes block to get them loaded.

I started suffering this problem with the gateways mod; turns out that the openloader datapack was not loading last in old worlds which had existed prior to certain mods being added. After disabling it from and enabling it in /datapacks, and using a /reload, it fixed the problem for both mods.

Fixed.