I'm seeing a few posts here about the configs not working... In my case the configs do seem to work but the displayed information seems to just be the default. Even if the client and server have the same settings, the server appears to display the default costs to the client instead of the ones in the config, and it doesnt seem like the client config is loaded unless making/joining a singleplayer world first?

the server appears to display the default costs to the client instead of the ones in the config

Configs aren't synced from the server to clients, so this is expected. The displayed cost will only be correct if the client config matches the server config.

it doesnt seem like the client config is loaded unless making/joining a singleplayer world first

Oh, I think I know why this would be happening. It's an oversight that should be relatively simple to fix.