NBT data for SmallFireballs is incomplete

Smallfireballs have broken movement when summoned or, when fired from a dispenser and the client relogs.

"ok, it seems that the nbt data for small fireballs is incomplete, I shot one out of a dispenser, immediately closed the map and after reload the fireball has the same broken movement" -Searge

A quick example here: https://youtu.be/FmpluuL0AjE