I was sitting on a ledge and sniping enemies from an extreme distance. I noticed some of them would go invisible as they walked around. In the picture you can see the gun/shadow of the gun.
I'm not sure if this is where I should be posting it. Just hoping this information has/will get to those who need to know.
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Yeah I had enemies disappear in front of me right before I reached a checkpoint. Can post video footage of it if needed.