It is possible to duplicate items by using the purse in the manufacturing table.
You have to make a recipe, and use the purse to take the items still in the manufacturing grid.
By right-clicking on an object, it will go to the purse, but the recipe will still be possible, so we can easily duplicate our objects.
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We're tracking this issue in MC-205454, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-205454