hey Sean,
i found this answer after i posted this.
it’s kind of a bug, but not really.
Looking over this, what is happening is that Functions from a Blueprint Interface with no output are considered Events by Blueprints that implement that Interface. Those won’t show up in Functions section of My Blueprints tab. What you would need to do to override their functionality is search for Event version of Function from right-click context menu and add that Event to your Event Graph.