Coupon Discount from Regular Price not Sale Price (Woocommerce)

I have products with a regular price of X and a sales price of Y. I would like to add a coupon with a code for a $45.00 discount to be taken from the regular price X.

I would like the coupon to disregard the sale price so I get X-$45 NOT Y-$45. But when the coupon is not applied price Y is used.

I found the following which works for percentage discounts, but I can’t seem to make it work for a fixed product discount price.

add_filter('woocommerce_coupon_get_discount_amount', 'woocommerce_coupon_get_discount_amount', 10, 5 );
function woocommerce_coupon_get_discount_amount( $discount, $discounting_amount, $cart_item, $single, $coupon ) {
    if ($coupon->type == 'percent_product' || $coupon->type == 'percent') {
        global $woocommerce;
        $cart_total = 0;

        foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $cart_item ) {

         $variable_product1= new WC_Product_Variation( $cart_item["variation_id"] );

         $cart_total += $variable_product1 ->regular_price * $cart_item['quantity'];
        } 
        $discount = round( ( $cart_total / 100 ) * $coupon->amount, $woocommerce->cart->dp );
        return $discount;
    }
    return $discount;
}

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