This is a well-known and talked-about bug from the past that still persists. I have seen a lot of people have evidence, videos, and photos in-game. Even though the pilot’s keen vision is full, a target inside the 1km ring goes invisible. Some people refer to it as a rendering problem, and others say it’s a spotting bug; however, it cannot be certain without the team looking into the subject. This bug makes it impossible to enjoy air sim with VR (Tested on multiple platforms on PC with different settings).