WooCommerce apply coupon for regular price instead of sale price

function.php

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;
	}

Would love to see a solution that works with fixed discount amounts. Any one has an idea?

Also, using this piece of code brakes the 'add to cart'-button? It's wont redirect to the cart after clicking? The page keeps loading..?