Iron sight sniper glint bug.

Do you have the flashlight attachment turned on?

I assume you are going for a ironsights / 1.0 scope run and gun type of sniper experience, and I assume you attached the flashlight to raise your hip fire accuracy. If you didn't turn it off, yeah, that is visible. 

I personally never attach a flashlight, but it does sound useful for hip fire, I just like the iron sights close range combat with snipers, but iron sights have scope glint for some reason( I’m on PS5, not sure on other platforms), so I get instantly spotted by everyone, it’s a pretty miserable experience.

I too enjoy playing that way. I had no idea about this bug, but I play alone. This might explain the amount of **bleep** kicking I've obtained while trying this. 

Maybe not a bug, potentially a very weird solution (which breaks our intended play style) to mitigate some of the eventual and inevitable ambitions hackers. If they can't stop em from hacking, they can at least give players a visual cue of where they are when they are headshotting across the map with iron sights. 

Obtuse theory, probably just a bug.