function pm_use_highest_level_slug_posts($term_slug, $term, $post, $terms, $taxonomy, $native_uri) {
    if(!empty($post->post_type) && $post->post_type == 'program' && !empty($term->term_id) && !$native_uri) {
        $term_slug = preg_replace('/([^\/]+)(\/(?:.*))/', '$1', $term_slug);
    }
    return $term_slug;
}
add_filter('permalink_manager_filter_term_slug', 'pm_use_highest_level_slug_posts', 9, 6);