Duplication of Items from Bundle Stacking

Using the bundle item introduced in the snapshot, I am able to stack empty bundles into them into a stack of 16 inside the first bundle. 

The bug is when I right-click to empty the bundle when there is a full inventory. The bundle empties the 16 bundles onto the ground, but it becomes a stack of 16 bundles once picked up(or however many bundles were put in there), which is normally not possible. 

This "stacked" bundle can be used to put any stack of items in it normally. However, it is possible to right-click into the inventory the stack of bundles out afterwards to get individual full bundles(place them in the inventory one at a time). These bundles can then be right-clicked to empty them and the items inside are duplicated. 

This is singleplayer, but I don't think that matters in this case.