Thats nothing you should worry about (if gives you an error just connect it with the world context variable).
But basicly, every function that comes from a function library (not from an actor), needs to have a reference in the world to be executed. That’s why it appears, when you call a function from a class that comes from the the class actor it will assume that the world context is the actor itself, that’s why it not appears in characters and actors, it still there but it just not visible.