WooCommerce Product Bundles - Bundled Products Not Synced in Translations

Overview of the issue

When translating a bundled product using WooCommerce Multilingual and WooCommerce Product Bundles, you may find that the translated product is missing all bundled items. This issue happens when there's a database inconsistency which prevents a proper synchronization of bundled product data in the translation.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open …/woocommerce-multilingual/compatibility/WcProductBundles/class-wcml-product-bundles.php file.
• Replace:

  					if ( ! $translated_item_id ) {
  						$menu_order = $this->wpdb->get_var(
  							$this->wpdb->prepare(
  								" 
                              SELECT menu_order FROM {$this->wpdb->prefix}woocommerce_bundled_items
  	                        WHERE bundle_id=%d AND product_id=%d
  	                        ",
  								$bundle_id,
  								$product_id
  							)
  						);
  
  						$this->wpdb->insert(
  							$this->wpdb->prefix . 'woocommerce_bundled_items',
  							[
  								'product_id' => $translated_product_id,
  								'bundle_id'  => $translated_bundle_id,
  								'menu_order' => $menu_order,
  							]
  						);
  						$translated_item_id = $this->wpdb->insert_id;
  						$this->set_translated_item_id_relationship( $item_id, $translated_item_id, $lang );
  					}
  

• With:

  					$check = $this->wpdb->get_var(
  						$this->wpdb->prepare(
  							"SELECT bundled_item_id FROM {$this->wpdb->prefix}woocommerce_bundled_items 
               WHERE bundled_item_id = %d AND bundle_id = %d",
  							$translated_bundle_id,
  							$translated_product_id
  						)
  					);
  					if ( !$check ) {
  						$menu_order = $this->wpdb->get_var(
  							$this->wpdb->prepare(
  								" 
                              SELECT menu_order FROM {$this->wpdb->prefix}woocommerce_bundled_items
  	                        WHERE bundle_id=%d AND product_id=%d
  	                        ",
  								$bundle_id,
  								$product_id
  							)
  						);
  
  						$this->wpdb->insert(
  							$this->wpdb->prefix . 'woocommerce_bundled_items',
  							[
  								'bundled_item_id' => $translated_item_id,
  								'product_id' => $translated_product_id,
  								'bundle_id'  => $translated_bundle_id,
  								'menu_order' => $menu_order,
  							]
  						);
  					}
  

• Finally, resave the original product.