Allows to sort the packing list excluding a given category tree

snippet.php

<?php

add_filter( 'woocommerce_get_product_terms', function ( $terms, $product_id, $taxonomy, $args ) {

	if ( isset( $_GET['wc_pip_action'] ) && ! empty( $_GET['wc_pip_document'] ) && 'packing-list' == $_GET['wc_pip_document'] ) {

		$terms = wp_get_post_terms( $product_id, $taxonomy, array(
			'orderby'      => 'parent',
			'order'        => 'DESC',
			'exclude_tree' => '33',
		) );
	}

	return $terms;

}, 10, 4 );