Gutenberg blocks not getting styled on back end

FWIW, there was an error in the wp_enqueue_style function I received. This one works fine:

    // Enqueue optional editor only styles
    wp_enqueue_style(
        'pbdsblocks-blocks-editor-css',
        plugins_url( $editorStylePath, __FILE__),
        [  ],
        filemtime( plugin_dir_path( __FILE__ ) . $editorStylePath )
    );

Note the third argument has changed to [ ] from ['wp-blocks']