I'm not seeing any output from these

fpw_debugging.php

<?php
add_filter( 'facetwp_pre_filtered_post_ids', 'my_facetwp_pre_filtered_post_ids', 10, 2 );
function my_facetwp_pre_filtered_post_ids( $post_ids, $class ) {
    var_dump($post_ids,$class,'hello world');
}
add_filter( 'facetwp_facet_html', 'my_facetwp_facet_html', 10, 2 );
function my_facetwp_facet_html( $output, $params ) {
    var_dump($output,$params);
}