Minecraft Bundle Stacking Item Dupe
If you give bundles a max_stack_size of more than 1, you can dupe items.
Just put the item you want to dupe in a bundle of stack 2.
Then hold the bundle in your cursor and right click and drag over multiple slots to put the bundle in separate slots.
Now the items in the bundle have duped.
Take out the items from the bundles and then put the bundles back together and repeat.
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