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.