[42.0.2] Heavy item duplication while foraging

[Hugo Qwerty]

Steps to reproduce:
1) Have more than 10 weight of stuff in your main inventory.

2) Select your backpack, so foraging items go in there.

3) Forage a very heavy item, I've confirmed that Base.LargeStone does this, and it first happened with Base.RailroadTrack (both weigh 40)

As the item is too big for the bag it should go into the main inventory, but as there is not enough space it should get dropped on the floor.

 

However, what actually happens is the item goes into your inventory - putting you above 50 - and it also gets dropped onto the floor, so you now have two of the item.

 

To make it more confusing, you can't drop the one you have in your inventory - I assume because the game thinks you're trying to drop something that is already on the floor.  You can place it on the floor though.

Note: to duplicate this I tweaked the forage defs to make LargeStone a lot more common, as it was taking ages to actually find one to test this.

No dropping:
 

 

Placing allowed (& does the highlight mean the game thinks they are the same item?)