Strictly speaking not a bug but
The Enforcer's 20% buff is active when you're disguised and more importantly while you're disguising. "Exploiting" this lets you disguise just before firing, fire, and repeat for a permanent 20% damage buff. Easy to make a script to do this for you.

It's still a nerf, as previously scripts existed to undisguise before firing. Now you get the same effect, but with the disguise smoke following you making you more obvious.