Hey Jason,
You are correct that you need to add the slideshow-fx UIkit component which is not automatically loaded with the slideshow components since it is only used for advance transitions.
Note that the slideshow-fx is an add-ons so it should be enqueued as such beans_uikit_enqueue_components( array( 'slideshow', 'slideshow-fx' ), 'add-ons' ); in a beans_uikit_enqueue_scripts callback function indeed.
Happy coding,