protected function update_attributes( &$product, $force = false ) {
		$changes = $product->get_changes();

		if ( $force || array_key_exists( 'attributes', $changes ) ) {
			global $wpdb;
			$attributes             = $product->get_attributes();
			$updated_attribute_keys = array();
			foreach ( $attributes as $key => $value ) {
				update_post_meta( $product->get_id(), 'attribute_' . $key, wp_slash( $value ) );
				$updated_attribute_keys[] = 'attribute_' . $key;
			}

			// Remove old taxonomies attributes so data is kept up to date - first get attribute key names.
			$delete_attribute_keys = $wpdb->get_col(
				$wpdb->prepare(
					// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared, WordPress.DB.PreparedSQLPlaceholders.QuotedDynamicPlaceholderGeneration
					"SELECT meta_key FROM {$wpdb->postmeta} WHERE meta_key LIKE %s AND meta_key NOT IN ( '" . implode( "','", array_map( 'esc_sql', $updated_attribute_keys ) ) . "' ) AND post_id = %d",
					$wpdb->esc_like( 'attribute_' ) . '%',
					$product->get_id()
				)
			);

			foreach ( $delete_attribute_keys as $key ) {
				delete_post_meta( $product->get_id(), $key );
			}
		}
	}