Projectiles don't reliably deflect fireballs shot from ghasts

The Bug:

Projectiles don't reliably deflect fireballs shot from ghasts.

Sometimes, projectiles can pass through the fireballs shot from ghasts without deflecting them.

Steps to Reproduce:

1. Obtain a bow and some arrows.
2. Summon a ghast and switch to survival mode.
3. Allow the ghast to shoot fireballs at you, and before the fireballs make contact with anything, shoot them with an arrow in an attempt to reflect them.
4. If the fireball was deflected, repeat step 3.

Observed Behavior:

Projectiles don't reliably deflect fireballs shot from ghasts.

Expected Behavior:

Projectiles would reliably deflect fireballs shot from ghasts.