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For whom having same problem with field “Product variation” — you must add this code to section “Misc Settings”
add_filter('woe_get_order_product_value_product_variation', function ($value, $order, $item, $product,$item_meta) {
$data = $item->get_meta("_ywapo_meta_data");
if(!is_array($data)) return $value;
$yith_meta = array();
foreach($data as $opt_group)
foreach($opt_group as $opt)
$yith_meta[] = $opt['display_label'] . ':' . $opt['display_value'];
$value .= " | " . implode(" | ", $yith_meta);
return $value;
}, 10, 5);