^I do not have and have not recorded any video of anything on Hawken.
My source is my eyes: I was in a match where a teammate was able to fire without breaking cloak. I asked him through chat how he was doing it and he didn't understand that not everyone could do it. A player from the enemy team also typed, "Puppet, wtf are you talking about? You just cloak and then you start shooting. Duh!" So, the next match we all met up on the map and they both proceeded to demonstrate - as did I to them.
For me, in my Infiltrator, if you shoot me while I'm cloaked, it automatically and instantly breaks the cloak.
I had forgotten about this and assumed it was fixed somewhere along the line until last night, where I saw it again.