Wrong generated page_name/slug on first publish of custom post type

When registering or updating any rewrite for any post/custom post type you need to flush rewrite rules by the admin panel or via code:

register_activation_hook( __FILE__, 'plugin_activation' );
function plugin_activation() {
    update_option('plugin_permalinks_flushed', 0);
}

add_action( 'init', 'register_custom_post_type' );
function register_custom_post_type() {
    global $wp;
    register_post_type( 'review', array(
        'label' => 'Reviews',
        'labels' => array(
        'name' => 'Reviews',
            /* etc */
        ),
        'description' => 'Tour reviews',
        'menu_icon' => 'dashicons-format-chat',
        'public' => true,
        'supports' => array(
            'title',
            'revisions',
            'author',
        ),
        'has_archive' => false,
        'show_in_rest' => true,
        'rewrite' => array('slug' => 'reviews'),
    ));

    if( !get_option('plugin_permalinks_flushed') ) {

        flush_rewrite_rules(false);
        update_option('plugin_permalinks_flushed', 1);

    }
}

https://developer.wordpress.org/reference/functions/flush_rewrite_rules/

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