Second this one! Wanikani has a script for this on website, and a “last completed item” button on 3rd party android app (Flaming Durtles). It’d be cool to go back, I can’t count how many times I wanted to check the previous one again for some reason. Whether it’s a sudden realization, and wanting to double-check, or deciding I want to check what grammar point was that to further study etc.
I know end-results show it, but by the time you finish reviews you either forget or don’t bother.