I came across this glitch at Belmont. The barriers disappear when you get to a point of being on the inside of the area. you can still see the shadow that they cast though...
That’s been like that since they built it. It’s one of those things that will stay like that forever because in general, as a player, you might go up there once out of curiosity, see the railings disappear, then never return there ever again, and as such it is of so little importance that it will never get up the list of things to be fixed.
