I was about to send a newsletter and was testing the voucher code. I noticed that there is a bug under one condition. I selected The Sale Product Restriction option as enabled as not to apply to sale items.
If I add a sale item to checkout with the voucher, no problem, code does not work. If I add one full price item and a sale item in checkout and then add the code, not problem. However, if I add a full price item, add the code, then continue shopping, add a sale item, the code will discount the sale item as well. I then need to click on update for the code to exclude the sale item. It is not a massive bug but it can cause issues with some customers questioning why is the discount amounting to £xx on one page and £x on the next page. I hope you can follow me.