Items thrown out of a players inventory start at Age 4800 instead of Age 0

When an item is dropped with the inventory closed, its age NBT tag starts at 0, and the item decays after 5 minutes when its age reaches 6000.
When an item is dropped while the inventory is open, its age NBT tag starts at 4800, and the item decays after 1 minute when its age reaches 6000.