Arrow's names change when fired by bow

If you have a bow and at least 2 arrows that have been renamed with an anvil, then fire the bow with the renamed arrows, if you collect the fired arrow off the ground it will change its name back to the "Arrow" name and start a new stack, rather than stacking with your other named arrows. I tested if it worked with a dispenser, and it did the same thing. It doesn't work with droppers, however.