Okay, I'm not sure if people have dealt with this problem before. But whenever I'm fighting ghasts, I usually opt to deflect their fireballs (Both with a sword and bow) whenever I'm at my manual ghast farm. But a repeating problem I've found regarding how the hit box of the fireballs is that it tends to glitch out and arrows pass through it. I had initially thought that this way simply me aiming just a tad over the hit box, but even after making the adjustments to my aim and aiming closer to the center of the fireball sprite. My arrows continue to glitch through the hit box and thus not strike it, resulting in the arrow hitting a nearby block, and my face getting hit by several fireballs. I've also found this issue to occur with using Tridents.