Alterar a Estrutura do Permalink de um CPT.php

function custom_tickets_rewrite_rule() {
    add_rewrite_rule(
        'tickets/([0-9]+)/?$',
        'index.php?post_type=tickets&p=$matches[1]',
        'top'
    );
}
add_action('init', 'custom_tickets_rewrite_rule', 10, 0);

function custom_post_type_link( $post_link, $post ) {
    if ( 'tickets' === $post->post_type && 'publish' === $post->post_status ) {
        return home_url( "/tickets/" . $post->ID );
    }

    return $post_link;
}
add_filter( 'post_type_link', 'custom_post_type_link', 10, 2 );