Productivity bar is saved when changing the recipe.

[ficolas]

When you click to change the recipe, and change it, the productivity purple bar is saved, so you can make the bar be almost full, take a better item, and... tada! duped!

Not much when thinking about most of the items but is a big dupe when you make it with the MK3 modules.

[kovarex]

Thanks, it will get fixed in 0.7.3