Fireball stuck in mid air, even after leave/reload

While fighting ghasts and blazes, for some reason (really not sure why) a fireball got totally stuck in mid air. It's just there, not moving.

I can't build any block on a 4x4x4 area around it. It deals no damage.

I can leave the nether and back, OR EVEN LEAVE MINECRAFT AND RELOAD EVERYTHING, and it is still there.

Screenshot attached. That fireball does not move and it's there for DAYS

– edit 1 –

Managed to get it out of there ... I got 4 blazes and 2 ghasts attacking me while I was investigating it, and it simply vanished (and I died _).

– edit 2 –

Unable to recreate, but after some consideration I'm positive it was a GHAST fireball, from the angle and height.