Deleted the scenery manager plugin, started a new scenario, still not seeing that option. Game shows 0.4.9 in game menu O_o
Definitely something odd going on here...
So I removed the entire plugins folder. Re-opened the game, confirm no plugins show. New scenario, still not seeing "restrict"... Loaded the bugged map to check fences missing, it's still bugged.
Only thing left is to full re-install which I'm not inclined to do right now since it's a somewhat minor bug gameplay wise (It was the last scenario to complete the game). Let me know if anyone looking at this needs more info tho!!