temp fix for index

<?php

/** Temporary fix for indexer bug in FacetWP 4.2.3 **/
/** Add to your (child) theme's functions.php **/
/** Remove again when FacetWP is updated to 4.2.4 **/

add_filter( 'facetwp_indexer_query_args', function( $args ) {
    $args['post_type'] = array_merge( $args['post_type'], get_post_types( [
        'exclude_from_search' => false,
        '_builtin' => true
    ]) );
    return $args;
});