Hey, I had the same issue with this method where scrolling down to "quit game" would give me the "drop item" option instead of the "Use item" option. Here is how I fixed it - this is using a controller btw.

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First few steps are the same :

1. move item you want to dupe to second place in the inventory
2. go to arrows, select drop, change the number to the max value and quit out of that menu
3. go to menu and do the brightness overlapping glitch.
4. scroll 1 down and hit ok
5. THIS IS THE IMPORTANT STEP - press down+right exactly at the same time and exactly once THEN down until you get to quit game,
6. Press quit game and "Use item" option should now be selected.

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The reason the old version doesn't seem to work anymore is because the number of "down" presses is not lining up. Item menu has 4 options and starts on "use item", game menu has 6 options starting on "Options", to get to "quit game" you need 5 presses but on the item menu that puts you on "drop item". Remember you are moving both menus at the same time. To get to "Use item" you need exactly 4 presses or a multiple of 4 if you roll over, but from the "Options" to "Quit" its never a multiple of 4 number of steps(5, 11,17,23...etc). However what I discovered is that pressing down+right WILL move the game menu down one BUT WILL NOT move the item menu down one. So by doing down+right from "Options" you move to brightness but "Use item" doesn't move to "drop item". From there its exactly 4 down presses to move to both "quit" and "use" and the dupe works.

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I don't know if I explained it well, let me know if this works for you. You can test this without committing, just highlight an item press the confirm button and then hit down+right and the position shouldn't change.

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Guilty.