[Gameplay] Jayce Ult

I noticed in one game i played in Howling Abyss that when transforming the Cannon to the Hammer, there was a very brief period of time that i still had the Cannon's attack range, allowing me to hit someone with the Hammer first hit buff from a safe distance. This happened 4 times during that match, and I'm pretty sure that this is unintentional. Anyone else have this happen to them?