u/Long-Development1053

Hi everyone,

I' really sorry for posting this here, I;m reaching out everywhere I can...

I'm looking for help repairing a Cities: Skylines II map with over 1000 hours of work.

After updating to 1.6.0f1, only this save has problems.

I have already:

• Verified Steam files.
• Completely reinstalled the game.
• Deleted all caches.
• Created a brand-new Playset.
• Reinstalled every mod.
• Confirmed that brand-new maps work perfectly.

So the issue appears to be inside the save itself.

The map loads and is playable, but the editor continuously throws:

EditorHierarchyUISystem
ArgumentOutOfRangeException
PrefabSystem.GetPrefab()

The latest Player.log only reports these unknown prefabs:

• Prop_EU_TrainPassengerCar01
• Prop_EU_TruckTractor01

Earlier logs also contained subway track prefabs, but those are now gone.

The exception repeats every frame, causing severe editor lag.

I'm happy to provide:

• Athens.cok
• Player.log
• Mod list

Does anyone know of a tool or method to repair orphaned prefab references inside a .cok save?

Any help would be hugely appreciated.