[Resolved] Split: Modification of internal links in Gutenberg

function myplugin_register_recipes_cpt_and_taxonomy() {
    // WPML-translatable slugs
    $recipe_slug       = apply_filters('wpml_translate_single_string', 'recipes', 'Custom Slugs', 'Recipe CPT Slug');
    $archive_slug      = apply_filters('wpml_translate_single_string', 'recipes-archive', 'Custom Slugs', 'Recipe Archive Slug');
    $category_slug     = apply_filters('wpml_translate_single_string', 'recipe-category', 'Custom Slugs', 'Recipe Category Slug');

    // Register CPT: Recipe
    $labels = array(
        'name'               => _x('Recipes', 'Post Type General Name', 'textdomain'),
        'singular_name'      => _x('Recipe', 'Post Type Singular Name', 'textdomain'),
        'menu_name'          => __('Recipes', 'textdomain'),
        'add_new_item'       => __('Add New Recipe', 'textdomain'),
        'edit_item'          => __('Edit Recipe', 'textdomain'),
        'new_item'           => __('New Recipe', 'textdomain'),
        'view_item'          => __('View Recipe', 'textdomain'),
        'all_items'          => __('All Recipes', 'textdomain'),
        'search_items'       => __('Search Recipes', 'textdomain'),
        'not_found'          => __('No recipes found', 'textdomain'),
        'not_found_in_trash' => __('No recipes found in Trash', 'textdomain'),
    );

    $args = array(
        'label'           => __('Recipes', 'textdomain'),
        'labels'          => $labels,
        'public'          => true,
        'has_archive'     => $archive_slug,
        'rewrite'         => array(
            'slug'       => $recipe_slug . '/%recipe_category%',
            'with_front' => false,
        ),
        'supports'        => array('title', 'editor', 'thumbnail', 'excerpt'),
        'taxonomies'      => array('recipe_category'),
        'show_in_rest'    => true,
        'show_in_menu'    => true,
    );

    register_post_type('recipe', $args);

    // Register Taxonomy: Recipe Category
    $taxonomy_labels = array(
        'name'              => _x('Recipe Categories', 'taxonomy general name', 'textdomain'),
        'singular_name'     => _x('Recipe Category', 'taxonomy singular name', 'textdomain'),
        'menu_name'         => __('Recipe Categories', 'textdomain'),
        'search_items'      => __('Search Recipe Categories', 'textdomain'),
        'all_items'         => __('All Recipe Categories', 'textdomain'),
        'edit_item'         => __('Edit Recipe Category', 'textdomain'),
        'add_new_item'      => __('Add New Recipe Category', 'textdomain'),
        'new_item_name'     => __('New Recipe Category Name', 'textdomain'),
    );

    $taxonomy_args = array(
        'hierarchical'      => true,
        'labels'            => $taxonomy_labels,
        'show_ui'           => true,
        'show_admin_column' => true,
        'rewrite'           => array(
            'slug'       => $recipe_slug,
            'with_front' => false,
        ),
        'show_in_rest'      => true,
    );

    register_taxonomy('recipe_category', array('recipe'), $taxonomy_args);

    // Rewrite tags and structure
    add_rewrite_tag('%recipe_category%', '([^/]+)', 'recipe_category=');
    add_permastruct('recipe', '/' . $recipe_slug . '/%recipe_category%/%recipe%', false);
}
add_action('init', 'myplugin_register_recipes_cpt_and_taxonomy');

/**
 * Replace %recipe_category% with actual slug in permalinks
 */
function myplugin_recipe_permalink($permalink, $post) {
    if ($post->post_type !== 'recipe') return $permalink;

    $terms = get_the_terms($post->ID, 'recipe_category');
    $slug = (!empty($terms) && !is_wp_error($terms)) ? $terms[0]->slug : 'uncategorized';

    return str_replace('%recipe_category%', $slug, $permalink);
}
add_filter('post_type_link', 'myplugin_recipe_permalink', 10, 2);

/**
 * Register WPML strings and flush permalinks on activation
 */
function myplugin_activate() {
    do_action('wpml_register_single_string', 'Custom Slugs', 'Recipe CPT Slug', 'recipes');
    do_action('wpml_register_single_string', 'Custom Slugs', 'Recipe Archive Slug', 'recipes-archive');
    do_action('wpml_register_single_string', 'Custom Slugs', 'Recipe Category Slug', 'recipe-category');

    myplugin_register_recipes_cpt_and_taxonomy();
    flush_rewrite_rules();
}
register_activation_hook(__FILE__, 'myplugin_activate');

$book_slug = apply_filters('wpml_translate_single_string', 'books', 'Custom Slugs', 'Book CPT Slug');
$category_slug = apply_filters('wpml_translate_single_string', 'book-category', 'Custom Slugs', 'Book Category Slug');

'rewrite' => array('slug' => $book_slug . '/%book_category%'),