ActorComponent does not replicate variables to client

Why would it run OnRep_VAR on the server when the component is not set up to replicate? Secondly, I’m using a custom ActorComponent subclass built in Blueprint as a ‘static actor component’. There does not appear to be a Component Replicates checkmark for my custom subclass. Perhaps I built it incorrectly? The variables in the custom subclass are marked for replication and so is the containing Actor.

EDIT: A quick test shows that the Component Replicates checkmark does not appear in the Class Defaults of a fresh ActorComponent Blueprint. What am I missing?