Hi,
That's a bug in the WorldPay plugin that has always been there. Thanks for reporting it.
It only happens when you have products with characteristics/variants in the order and it is not linked to the update.
You can fix that by changing the line:
$vars["C_item_name_".$i]=substr($product->order_product_name,0,127);
to:
$vars["C_item_name_".$i]=substr(strip_tags($product->order_product_name),0,127);
in the file plugins/hikashoppayment/bf_rbsbusinessgateway/bf_rbsbusinessgateway.php
We'll add that on our end too.