Unifaun - Force Weight

functions.php

<?php
/**
 * @snippet       WooCommerce - Adds Default weight to parcel
 * @author        Redlight Media AB / Christopher Hedqvist
 * @compatible    WooCommerce 4.5.1
 */
function redlight_unifaun_force_minimum_weight( $shipment, $order) {
        foreach( $shipment['parcels'] as $i => $parcel ) {
            $shipment['parcels'][$i]['weight'] = 0;
        }
    
    return $shipment;
}
add_filter('ac_wc_unifaun_shipment_data', 'redlight_unifaun_force_minimum_weight', 10, 2 );