Hi
We've noticed on newer versions that saving products in an anonymous cart, isn't kept when the user logs in, even though the "Keep anonymous cart when user logs in" and "Merge the anonymous cart content with the cart saved on the user when logging in" options are checked.
Here's a screencast while testing in the 9.10.16: https://www.screencast.com/t/B2lccz9W
Here's testing in the 9.12.17 (most recent) : https://www.screencast.com/t/iLytkKvq5zYM
It was working fine in the DW 9.10.09, we then upgraded to the most recent version and it isn't working as intended.