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Skeletron Prime
The first bug I've found it that if you put anything craftable into the guide's crafting thing it shows nothing and fills up your inventory with w/e the item was at max stacks then drops the actual item you put into the crafting box when you close the window.
EDIT: For some items it does actually show what you can make (maybe just items that have no Exxo only recipe?) but the duplicates it gives you vanish after removing one of the stacks, however, it still gives you a max stack of the initial item you put into the box.
Okay that is a wacky bug for sure xD. It's possible I missed something in the recipe class or the part in Main that deals with the guide slot. I'll look at it tomorrow.