Disable currency conversion on Virtual coupon

Hi,

We have 2 currency USD and INR

we are applying a virtual coupon discount, discount is 50% of the cart subtotal

it work properly when we are in base currency, but when we switch to other currency it goes wrong

our code takes the subtotal (which is already converted to other currency) and then applies that amount as discount (but here it goes wrong) you plugin applies the conversion again on this amount so its gives wrong result

We want to know how to disable the currency conversion on our coupon

here is our coupon code you can try it on your end

class virtual_coupon_test{
	function __construct(){
		add_action('woocommerce_before_calculate_totals', array($this,'applyDiscountCode'));
		add_action('woocommerce_after_calculate_totals', array($this,'applyDiscountCode'));
		add_filter('woocommerce_get_shop_coupon_data', array($this, 'addDiscountCouponData'),10,3);
	}

	function applyDiscountCode(WC_Cart $cart){
        $cart->applied_coupons[] = "pisol-cdrw-discount:test";
    }

	function addDiscountCouponData($false, $data, $coupon){
		
        if(!function_exists('WC') || !isset(WC()->cart) ) return false;

		$coupon_id = "pisol-cdrw-discount:test";

		$subtotal = WC()->cart->get_subtotal();

		$off = $subtotal * 50 / 100;

        $coupon->set_discount_type('fixed_cart');
        $coupon->set_description( 'Test coupon' );
        $coupon->set_amount(abs($off));
                
        return $coupon;
            
    }

}

new virtual_coupon_test();