I don't know if it is a bug, but it looks like this 'pillar' is somewhat clipping into wall behind it (like it should be connected to this wall, but it isn't). It's located in the eastern side of the caves with outposts you need to activate.
Something similar - I think you're supposed to see through these small crevices?At least in this case, it would've provided a nice sneak peek into the cavern beyond (there were destructible rocks blocking the way)edit - This is from map lux-a12. There are a couple of similar crevices, but this is the most obvious one.