Using version 1.2.1, the end cake doesn't appear to work in multiplayer. Tested working in single player. Clicking on the cake to use it, doesn't teleport the player. It also doesn't eat a slice.

Are you sure your player is hungry? They need to be to use it, but that can be disabled in the mod's config.

I'm laughing my arse off. Yes. That's the issue. xD Thanks and my apologies!