There’s been an issue about this on lemmyverse’s Github for about a month, link here. It seems like there’s an issue where lemmy.world is responding incorrectly when it is scanned for communities, and since it hasn’t been fixed lemmyverse hasn’t been scanning lemmy.world.
You may like this pattern of starting all custom commands with a comma - benefits against a wrapper command would be shorter command names and built-in tab completion.