2.1.5 - Paypal Express - Cart is not clearing out after redirect to PayPal

[yatping]

Preconditions

1. Mage 2.1.5

Steps to reproduce

1. Add Product with Qty 1 to cart
2. Place order and redirect to Paypal
3. Open another window to edit the cart and change the Product Qty to 2
4. Go back to original window and continue Paypal payment with 1 Qty
5. Successful order processed, payment capture
6. Order is created with Product Qty 2

Expected result

1. Should the cart be cleared after redirecting to Paypal payment?

Actual result

1. [Screenshot, logs]

[YevSent]

Hi, @yatping, described flow doesn't look like a valid. The cart should be cleared after successful place order, the redirect to PayPal side it's only a part of place order flow.