This seems to be the exact same error that was orginally present on pre 2.2.4 installations of Magento. However the Js file that causing the duplicate error has now been removed. Has anyone else come across this issue?
Steps to reproduce
- Add a simple product in the Magento Admin.
- Go to product detail page in Store Front.
- Add quantity of 1 to cart.
- Click on Add To Cart.
- Verify the quantity by looking at the Mini Cart at the upper-right corner.
- Click on Amazon Pay Button.
- Verify the quantity is still.
- Leave checkout.
- Click on Amazon Pay Button
- Total Quantity in Cart of Simple Product is now 2
Every other checkout method the duplication of products does not occur. Only when clicking on the Amazon pay button does it occur.