One of the existing problems is that the client shows everyone as a blue dot in the distance, e.g. if you have the compass zoomed to 250m. Only once they're close to you they become a red / purple dot. So one would still be able to sort of "see" people from a distance, while they're still "blue" (client didn't check faction yet?) - if they then disappear, it's clear they're a hostile entity.
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