Not sure how it would fit in your workflow, but you can avoid that back-button bug by using the "read later" share intent (it's the pin with a white background

Not sure how it would fit in your workflow, but you can avoid that back-button bug by using the "read later" share intent (it's the pin with a white background instead of blue). With that one you get a toast message saying the bookmark has been added but you never leave the original app. That does mean you don't get to add tags at that time, though.