Items in the arrow tag are able to be used like arrows from bows but not dispensers.

To Reproduce

1. Load attached datapack in a world.
2. Get dirt and a bow.
3. Enter Survival mode.
4. Use the bow.
5. Notice the dirt is used as an arrow.
6. Return to creative.
7. Get a dispenser, a button, and dirt.
8. Place the dispenser, place the button on the dispenser, and the dirt inside it.
9. Notice that the dirt is spat as an item.