http://www.pcgamer.com/destiny-2s-broken-prometheus-lens-rifle-wont-be-fixed-until-next-week/

The Prometheus Lens exotic trace rifle that came to Destiny 2 in the Curse of Osiris expansion isn't just overpowered, it's straight-up broken. Its ability to insta-fry enemies is great as long as you're on the right end of it, but if you're not, it's just a wildly unfair, face-melting piss-off. Bungie community manager David "Deej" Dague said yesterday that the weapon is bugged, and the studio would address the issue on its blog, and so it has—sort of. 

The good news is that Bungie knows that its PvP modes are bust with the gun the way it is. The bad news is that it's going to stay that way for awhile anyway. Bungie said in its latest Bungie blog update that it will roll out a fix as soon as possible, but it won't be until next week sometime.