'Duplication Bugs'

In most cases so far of the duplication bug reports, it's semi-intentional for items that it doesn't really matter; e.g.: you can get more than 4 string by running a wool block through the blade; and you can get more bonemeal by running a bone block through; you get one more nugget than 9, for running an ingot through. The idea is the blade is more efficient than using your hands on a crafting table.

Every single one of these resources you can make a farm for in 100% vanilla with the same, or less work than spending hours at a crafting table and stonecutter "abusing" the system, and each one gets you far greater returns:

Bonemeal: A skeleton farm gets you bows, arrows, bones, and XP. "Abusing" the stonecutter actually gives you a net loss. You can also just put your excess wheat seeds in a composter for infinite bonemeal also. No need to "abuse" for it.

Iron: A golem farm gets you infinite iron, red dye via poppies, and string... and XP. You're still wasting your time "abusing" the stonecutter by doing this way, since it's a net loss on items and XP.

Gold: Piglin farm can get you golden swords, crossbows, armor, and XP, Zombie versions give you gold ingots, gold nuggets, holden swords, and XP. You're missing out on a lot if you're wasting your time "abusing" the stonecutter instead of farming one of these, since it's still a net loss on Items and XP.

Wool: You can shear a sheep and get more wool than you will in the time it takes you to open your menu and drag a wool block into the stonecutter the first time. You can also use a spider farm to get spider eyes, string, and XP. "Abusing" the stonecutter actually still gives you a net loss.

Since there's vanilla ways to get infinite of all of these way better, I don't find it to be a bug, and it's semi-intentional.

That said if you still can't handle them being there, you can open the jar file and go to data/actuallyusefulstonecutter/recipes and change or remove them entirely, so I'm leaving them alone for those of us who don't care.