wrong amount order for person who reveive gift card

hello there is a problem in the plugin, when the gift card is used it is made bad discounts, instead of behaving like the woocommerce discount codes where the amount is deducted for each product line and therefore for each vat tax rate associated with the product, your discount does not take into account the vat rates and makes a reduction after the subtotal.
This results in a bad discount not taking into account the VAT rates of the products and then it makes bad invoices and bad VAT declaration to the state…

example the first French customer buys a gift card of 100€ with 20% VAT standard rate, he offers it to a Belgian customer who buys products at the standard Belgian rate 21% and products at the standard Belgian rate 6%, his total product is 105€ VAT included, actually with the plugin he will have that:
1 x article at 80€ including 13,33€ vat at 21%.
1x book at 25€ of which 1,42€ VAT at 6%.
subtotal 90,25€ excl. VAT
VAT at 21% 13,33
VAT at 6% 1,42
gift card -100€ (including 20% VAT? purchase in France other country other VAT, wrong rate for the country of the recipient of the card belgium?)
total 5€ to pay

there should have been a deduction for each product line with the right vat rate.
I hope this is clear as an explanation, for now the plugin is only functional if you have a store that sells without VAT, otherwise the management of VAT is wrong ??