Citizen not found errors when using walking tours

[dymanoid]

How to reproduce:

• Use latest TM:PE and Cities:Skylines
• Park Life DLC required
• create a new city (or use existing one)
• activate all advanced AI options in TM:PE
• create a walking tour in a popular park
• wait for a couple of minutes and inspect the game log

In the log, there are following errors:

Citizen not found!
   at System.Environment.get_StackTrace()
   at Building.RemoveTargetCitizen(UInt16 instanceID, CitizenInstance ByRef data)
   at TouristAI.SetTarget(UInt16 instanceID, CitizenInstance ByRef data, UInt16 targetIndex, Boolean targetIsNode)
   at CitizenAI.SetTarget(UInt16 instanceID, CitizenInstance ByRef data, UInt16 targetBuilding)
   at TrafficManager.Custom.AI.CustomHumanAI.CustomArriveAtDestination(UInt16 instanceID, CitizenInstance ByRef citizenData, Boolean success)
   at TrafficManager.Custom.AI.CustomHumanAI.CustomSimulationStep(UInt16 instanceID, CitizenInstance ByRef instanceData, Vector3 physicsLodRefPos)
   at CitizenManager.SimulationStepImpl(Int32 subStep)
   at SimulationManagerBase`2.SimulationStep(Int32 subStep)
   at CitizenManager.ISimulationManager.SimulationStep(Int32 subStep)
   at SimulationManager.SimulationStep()
   at SimulationManager.SimulationThread()  [Core]

and the same for ResidentAI:

Citizen not found!
   at System.Environment.get_StackTrace()
   at Building.RemoveTargetCitizen(UInt16 instanceID, CitizenInstance ByRef data)
   at ResidentAI.SetTarget(UInt16 instanceID, CitizenInstance ByRef data, UInt16 targetIndex, Boolean targetIsNode)
   at CitizenAI.SetTarget(UInt16 instanceID, CitizenInstance ByRef data, UInt16 targetBuilding)
   at TrafficManager.Custom.AI.CustomHumanAI.CustomArriveAtDestination(UInt16 instanceID, CitizenInstance ByRef citizenData, Boolean success)
   at TrafficManager.Custom.AI.CustomHumanAI.CustomSimulationStep(UInt16 instanceID, CitizenInstance ByRef instanceData, Vector3 physicsLodRefPos)
   at CitizenManager.SimulationStepImpl(Int32 subStep)
   at SimulationManagerBase`2.SimulationStep(Int32 subStep)
   at CitizenManager.ISimulationManager.SimulationStep(Int32 subStep)
   at SimulationManager.SimulationStep()
   at SimulationManager.SimulationThread()  [Core]

Such an error is logged when the game detects a broken linked list of citizen instance IDs - see method Building.RemoveTargetCitizen. I guess TM:PE breaks these lists for walking tours somewhere.

I didn't encounter these errors without TM:PE, they seem to be caused by this mod.