What I expected to happen was the command would summon a FallingSand That looks like Water riding a FireBall at your location with a off set of ~1 ~ ~1

What actually happened was a massage that said "Unbalanced Brackets" when there wasn't because it was chopping it off at 100 characters is if I was typing it into the chat

Steps to Reproduce:
1.copy this command to a command block
tellraw @a {"text":"", "extra": [

{ "text":"Spells", "color":"yellow" }

,

{ "text":"", "color":"red" }

, { "text":" [Fire] ", "color":"dark_red", "clickEvent": { "action":"run_command", "value":"/summon Fireball ~1 ~1 ~1

{ExplosionPower:1,direction: [0.0,0.0,0.0]}

" }, "hoverEvent":

{ "action":"show_text", "value":"Fire Ball" }

}, { "text":"[Water]", "color":"blue", "clickEvent": { "action":"run_command", "value":'/summon FallingSand ~ ~3 ~ {Time:1,TileID:9,Riding:{id:"Fireball",ExplosionPower:0,direction: [0.0,0.0,0.0]}}' }, "hoverEvent":

{ "action":"show_text", "value":"Water Bomb" }

} ]}
2.Power the command block
3.press [Water] in the chat
4.Read message
5.Fix bug