Oh no, I just noticed that all the guards lights in missions are missing in the current Itch release.
I did play-test thoroughly before releasing. Since guard awareness is based on sight distance, I didn't really miss the guard light cones. I heard no one else about this, so I guess other players also don't miss the guard lights in this release either.
Anyway, I'll make sure to enable the guard lights in the next release. In fact, I'll add a line of code that always enables the guard lights, even if I forget to manually enable it. I did the same for the player line of sight. In the next version it is more important, because the sight distance is fully replaced by the challenge-style guard lights. I think it makes the game more predictable and tense. Sight distance based guard awareness doesn't always feel fair, because it's invisible to the player.