Item Duplication glitch

[LordMisterX]

Bug description
By using the delivery mods parcel or envelope, you can duplicate any item, by placing it in the items inventory, then throwing the parcel/envelope by pointing at it and pressing Q while its open, take the items out of it, pickup the parcel/envelope and find that it still has the items in it. You can also use the aerial interface from pneumaticcraft to take the parcel/envelope from your hand with it open and dupe the items.

Steps to reproduce the issue

1. Take parcel
2. place 16 diamonds in it
3. throw parcel out of your inventory by pointing at it and pressing Q
4. take the diamonds out of the still open inventory and pickup the parcel
5. repeat steps 3 and 4

Expected behavior
The inventory either should close if for any reason the item gets removed from your hand or prevented from being thrown/pulled out of your inventory.