Update Slug CCT.php

<?php

add_filter( 'jet-engine/custom-content-types/item-to-update', function( $item, $fields, $handler ) {
    
    $post_id = ! empty( $item['cct_single_post_id'] ) ? absint( $item['cct_single_post_id'] ) : false;
    
    if ( ! $post_id ) {
        return $item;
    }
    
    $post = get_post( $post_id );
    
    $has_single = $handler->get_factory()->get_arg( 'has_single' );
    
    if ( ! $post || ! $has_single ) {
        return $item;
    }
    
    $title_field = $handler->get_factory()->get_arg( 'related_post_type_title' );
    
    $postarr = array(
        'ID' => $post_id,
    );
    
    if ( $title_field ) {
        $postarr['post_name'] = isset( $item[ $title_field ] ) ? $item[ $title_field ] : '';
    }
    
    wp_update_post( $postarr );
    
    return $item;
    
}, 0, 3 );