Item cloning bug

[Anihamilitor]

Straight to the point, if an NPC is supposed to give/possibly sell you something but you have a full inventory and another copy of the item you're receiving (don't think it works on stackable items like grenades), that item will be cloned inside your inventory (invisible, but will appear as soon as you have some free room in there) and yet again at your feet. The NPC will also retain the item and try to give it to you again in a few seconds.
Example: I sent Jaime Reyes to Hong Kong, and just found the aug upgrade at Lucky Money after finishing up everything else. Forgot about it, talked to the good doctor, and JC said I'm carrying too much stuff. After the obvious upgrade, I noticed i have another one in my backpack, and yet another one at my feet.
Did this again later with Savage and aug upgrade from dead MiB in the ocean lab, and JC started laying them like eggs again. Leads me to believe that this can be replicated with any unstackable item you can receive/buy like weapon mods, but I didn't test that.
This can completely break the game's balance.

[PolaricEntropy]

Yup, that's a known bug with the conversation system from the original. And a bit hard to track down as we haven't yet been able to fix it.

[Anihamilitor]

Well, I've thought about this. Would you consider making those items stackable?
I don't think there is a single situation in-game that would make the player benefit from stacking weapon mods or aug upgrades, and I believe it would get rid of the cloning possibility so there doesn't seem to be any downside, a very, very minor upside and an easy fix for this particular bug.