Non-biological entities play footstep sounds

Arrows / fire charges / ender pearls / items / eggs / snowballs / splash potions / lingering potions / experience bottles play footstep sounds.

Reproduce:

1. Throw a ender pearl / egg / snowball / splash potion / lingering potion / experience bottle. (Fixed in 1.2.10.1)
2. Shoot an arrow / fire charge. (Fixed in 1.2.10.1)
3. Discard an item on the ice.