Shulker Box and bundle item entities don't account for count when dropping contents

If a stack of bundles or shulkers is dropped as an item and destroyed it will only drop for one.

To Reproduce:

1. /give @s bundle[minecraft:max_stack_size=2]

2. place atleast one item in the bundle

3. copy with middle mouse click

4. drop whole stack onto the ground

5. /summon tnt

6. pick up remaining items and notice there is only the quantity of a single bundle, not multiple