Hi after the recent update, i have been facing this problem and my customers are complaining every day. Basically, when customers add a bundle product in the cart and after pressing checkout, there's a message popping out saying your cart is empty. This problem only occur for bundle product. We tried puting single product and bundle product in the same cart, but after pressing checkout only the single product is shown on the checkout page. 

Please help me resolve this issue as i have customers waiting