GMail breaks the back button in this way. There are intermediate "pages" in the app in some cases such that hitting the "back" button puts the browser in a state that causes a replay of the thing that brought the page from which you were clicking the "back" button. This happens a lot when searching through mail.
Once you're aware of it, it's simple enough to hold the back button and then go back several entries at once, but maybe this change will remove the "when I hit back, it goes back and then forward to where I was when I hit back" behavior in the first place.
Once you're aware of it, it's simple enough to hold the back button and then go back several entries at once, but maybe this change will remove the "when I hit back, it goes back and then forward to where I was when I hit back" behavior in the first place.