It works fine on its own, so yes, it is a mod conflict.
If you post the list of mods you're using in that playset, I might be able to hazard a guess as to which one it is.
Apparently my list of mods is too long for 1 post, so I'll do it in 3.
I18n EveryWhere
Unified Icon Library
Asset Icon Library
ExtraLib
ExtraDetailingTools
ExtraLandscapingTools
Map Texture Replacer
Asset Packs Manager
Anarchy
Better Bulldozer
ExtraAssetsImporter
Find It
529 Tiles
Road Builder [BETA]
Compass
AutoSaveAlwaysOn
French Pack
Home of Chamëleon TBN
Bridge Expansion Pack
MiniParks Asset Pack
Traffic
Move It
Line Tool
Water Features
Tree Controller
Extra Networks and Areas
Plop the Growables
Tigon's Rail Infrastructure Pack
Traffic Lights Enhancement Alpha
Zoning Toolkit
Skyve [BETA]
Extended Tooltip
Overground Parking By Dome
Recolor
Achievement Enabler
First Person Camera Continued
Realistic Parking Mod
School Capacity Balancer
Riverbeds Texture Pack
More Parks
Mini Elementary School Asset (Upgradable)
Small Subway Garage and Train Garage Asset
More Parking
Local Hospital Upgradable
More Education Buildings
All Aboard! (Faster Boarding Mod)