Firework summons in 1.11

Before 1.11, this command would summon a firework entity.

/summon FireworksRocketEntity ~ ~ ~ {LifeTime:20,FireworksItem:{id:fireworks,Count:1,tag:{Fireworks:{Explosions:[

{Type:0,Flicker:0,Trail:0,Colors:[16777215],FadeColors:[16777215]}

]}}}}

Since 1.11, it generates the "Unable to summon object" error in the command block. Is there a new way to summon firework entities?