small fireballs turn into fireballs (large) when relogging.
command: /summon minecraft:small_fireball ~ ~1 ~

{Motion: [0.0d, 0.0d, 0.0d], Invulnerable: 0b, Air: 0s, OnGround: 0b, ExplosionPower: 1, PortalCooldown: 0, Rotation: [89.999985f, -89.999985f], life: 0, FallDistance: 0.0f, Fire: 20s, power: [0.0d, 0.0d, 0.0d], direction: [0.0d, 0.0d, 0.0d]}