[Escalated to WPML Developers team] WooCommerce Bookings & duplicate Bookings

	public function duplicate_booking_for_translations( $booking_id, $lang = false ) {
		$booking_object = get_post( $booking_id );

		$booking_data = [
			'post_type'   => self::POST_TYPE,
			'post_title'  => $booking_object->post_title,
			'post_status' => $booking_object->post_status,
			'ping_status' => 'closed',
		];

		$active_languages = $this->sitepress->get_active_languages();

		foreach ( $active_languages as $language ) {

			$booking_product_id = get_post_meta( $booking_id, self::BOOKING_PRODUCT_ID_META, true );
			$type = get_post_type($booking_product_id);
			$trid = apply_filters( 'wpml_element_trid', NULL, $booking_product_id, 'post_'. $type  );

			$translations = apply_filters( 'wpml_get_element_translations', NULL, $trid,  'post_'. $type );
			if (isset($translations[$language["code"]]) && $translations[$language["code"]]->source_language_code != NULL) {
				if ( ! $lang ) {
					$booking_language = $this->sitepress->get_element_language_details( $booking_product_id, 'post_product' );
					if ( $booking_language->language_code === $language['code'] ) {
						continue;
					}
				} elseif ( $lang !== $language['code'] ) {
					continue;
				}

				$booking_persons       = maybe_unserialize( get_post_meta( $booking_id, self::BOOKING_PERSONS_META, true ) );
				$trnsl_booking_persons = [];

				if ( is_array( $booking_persons ) && ! empty( $booking_persons ) ) {
					foreach ( $booking_persons as $person_id => $person_count ) {

						$trnsl_person_id = apply_filters( 'wpml_object_id', $person_id, 'bookable_person', false, $language['code'] );

						if ( is_null( $trnsl_person_id ) ) {
							$trnsl_booking_persons[] = $person_count;
						} else {
							$trnsl_booking_persons[ $trnsl_person_id ] = $person_count;
						}
					}
				}

				$trnsl_booking_id = wp_insert_post( $booking_data );
				$trid             = $this->sitepress->get_element_trid( $booking_id );
				$this->sitepress->set_element_language_details( $trnsl_booking_id, 'post_' . self::POST_TYPE, $trid, $language['code'] );

				$meta_args = [
					self::BOOKING_ORDER_ITEM_ID_META => 0,
					// translated product (id) may not exists
					self::BOOKING_PRODUCT_ID_META    => $this->get_translated_booking_product_id( $booking_id, $language['code'] ),
					self::BOOKING_RESOURCE_ID_META   => $this->get_translated_booking_resource_id( $booking_id, $language['code'] ),
					self::BOOKING_PERSONS_META       => $this->get_translated_booking_persons_ids( $booking_id, $language['code'] ),
					self::BOOKING_COST_META          => get_post_meta( $booking_id, self::BOOKING_COST_META, true ),
					self::BOOKING_START_META         => get_post_meta( $booking_id, self::BOOKING_START_META, true ),
					self::BOOKING_END_META           => get_post_meta( $booking_id, self::BOOKING_END_META, true ),
					self::BOOKING_ALL_DAY_META       => intval( get_post_meta( $booking_id, self::BOOKING_ALL_DAY_META, true ) ),
					self::BOOKING_CUSTOMER_ID_META   => get_post_meta( $booking_id, self::BOOKING_CUSTOMER_ID_META, true ),
					self::BOOKING_DUPLICATE_OF_META  => $booking_id,
					'_language_code'                 => $language['code'],
				];

				foreach ( $meta_args as $key => $value ) {
					update_post_meta( $trnsl_booking_id, $key, $value );
				}

				WC_Cache_Helper::get_transient_version( 'bookings', true );
			}

		}

	}