So I was in a cave and saw a group of 2 programmers. At that time, I had a sensor array but no interpreter, so all I could see is the red '?' when outside my view. However, when I approached them, I caught sight of the group of programmers, but one of them remains '?' even though it should be within my view! And yet, I could even see all the other surrounding terrain and the programmer that's even further away from me. Bug?
(https://i.imgur.com/W4tkv8i.png)