Mecha Kha'zix.. Bug?

Something I've wondered about for awhile lately..

Kha'zix's Void Spikes animation with his mecha skin looks nothing at all like it used to, atm it's just a single puny rocket (3 puny rockets when evolved) as opposed to this barrage of missiles and explosions that it used to be (which you can see in the linked video)

Was this intentionally changed? Or has it been bugged?