“ADDITIONAL CSS CLASS[ES]” no longer available on Query Loop block

Hi. I’ve used a trick I learned from this support team in a number of places. The trick is where you use a CSS class name assigned to a block to serve as a “trigger” in various filters, indicating that the filter should process whatever when the class is present, and ignore processing when the class is missing. See https://generate.support/topic/control-query-loop-block-with-postmeta-query-parameter/ for an example.

Today I went and wrote this code:

add_filter( 'generateblocks_query_loop_args', function( $query_args, $attributes ) {
    if ( ! is_admin() &&
         ! empty( $attributes['className'] ) &&
         strpos( $attributes['className'], 'af-query-loop-empbio-trigger' ) !== false ) {
        $new_query_args = [
            'meta_query' => [
                [
                    'key'     => 'af_author',
                    'value'   => get_the_ID(),
                    'type'    => 'NUMERIC',
                    'compare' => '=',
                ]
            ]
        ];

        $query_args = array_merge( $query_args, $new_query_args );
    }

    return $query_args;
}, 10, 2 );

…and when I went to assign a CSS class of “af-query-loop-empbio-trigger” to the Query Loop block, I discovered that the “Advanced” section was empty, no longer exposing the “ADDITIONAL CSS CLASS[ES]” field.

I can understand why this might have been done, after all, you don’t apply CSS to the Query Loop block itself. But what about those of us who have followed your lead with this technique? What are we to do now? Do you have an alternative technique you can recommend?