When manually reviewing a quiz attempt to adjust the grade, there is an "Update" button at the bottom of the page. When a teacher clicks on it, the grade for the attempt updates, but then the attempt page just sits there.
I scrolled to the top of the page expecting to find a "Return" button, similar to what there is in most other places in the interface, but there isn't one. I had to hit the back arrow in my browser.
There's nothing inherently wrong with the back button, but it doesn't align with the established interface vocabulary.