order discount tax

-- HikaShop version -- : HikaShop Starter: 6.1.0
-- Joomla version -- : 5.4.0
-- PHP version -- : 8.3
-- Browser(s) name and version -- : chrome
-- Error-message(debug-mod must be tuned on) -- : "order_discount_tax": "0.00000",

Regardless of the VAT rate set for the coupon, I always see 0.00000 in the logs.
"order_discount_tax": "0.00000",