Tracks Technical issue with objects (AC_SEMAPHORE) that disappear in-game

[GaryUK]

I'm having an issue with a track - it's new, i.e. I only just noticed it and I'm certain it wasn't always an issue - where the AC_SEMAPHORE objects disappear as the car gets close. So, e.g., as you can see in the images below, the start gantry lights are on and visible when the car is far away, but the lights disappear as the car gets closer. The same thing happens with the pit exit lights, again AC_SEMAPHORE. These objects are behaving almost like a reverse-LOD, where they're visible when far away but they are not rendering when the car gets closer. This is my track and I know that I did not set any LOD IN, OUT for these particular objects.

Car Far-Away, start gantry and pit lights rendering correctly

Car Closer. You can see the green and red light objects have stopped rendering, leaving a hole in the egg-crate gantry

When I change SEMAPHORE object names to something else the issue goes away. So, the problem is with the semaphore system, not the meshes.
My semaphore.ini file:

[GROUPS]
DISQUALIFIED=0
READY=4
START=1

[COLOR]
INTENSITY=10.0

[OBJECT_0]
TYPE=1
NAME=AC_SEMAPHORE_RED_1
ORDER=0

[OBJECT_1]
TYPE=1
NAME=AC_SEMAPHORE_RED_2
ORDER=1

[OBJECT_2]
TYPE=1
NAME=AC_SEMAPHORE_RED_3
ORDER=2

[OBJECT_3]
TYPE=1
NAME=AC_SEMAPHORE_RED_4
ORDER=3

[OBJECT_4]
TYPE=2
NAME=AC_SEMAPHORE_GREEN_1
ORDER=0

[OBJECT_5]
TYPE=1
NAME=AC_SEMAPHORE_RED_5
ORDER=0

[OBJECT_6]
TYPE=2
NAME=AC_SEMAPHORE_GREEN_2
ORDER=0

INTENSITY=15.5

What's odd is it's only this track, i.e. it's not my installation of AC.

 

[GaryUK]

So, I have discovered this issue only occurs with CSP 1.80
The problem goes away with CSP 1.79 and earlier