Need help on VRPTW with break intervals in C#

[bhaskar-ghub]

OR Tool/Language used:
Version: v9.6
Language: C#
Solver: Routing
OS: Windows 11

I am trying to get an optimal route solution for a VRPTW problem where vehicles (in my example, I have 10 vehicles) have to be certain locations within specific time windows, and the vehicles will start and end at different locations (note: for a given vehicle, the start and end location will be the same).

A vehicle can have one or more break intervals during the day (For Example: vehicle 1 need breaks at specific intervals (Break interval 1: Between 11:00 and 12:00, Break interval 2: Between 19:00 and 21:00)).

// Configuration I have is 10 vehicles to make 7 services and below is the code snippet I have tried to introduce break intervals for a vehicle,

  int timeAtServiceLocation = 180;
  long[] Demands = new long[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1};
  vehicles[0].Breaks = "[{'startTime': '11:00', 'endTime': '12:00'},{'startTime': '19:00', 'endTime': '21:00'}]";
  RoutingIndexManager manager = new RoutingIndexManager(distanceMatrix.GetLength(0), vehicles.Count, StartPos, EndPos);
  RoutingModel routing = new RoutingModel(manager);
  RoutingDimension timeDimension = routing.GetMutableDimension("Time");
  Solver solver = routing.solver();
  IntervalVarVector breaks = new IntervalVarVector();
  long[] node_visit_transit = new long[routing.Size()];
  
  for (int i = 0; i < routing.Size(); ++i)
  {
      int node = manager.IndexToNode(i);
      node_visit_transit[node] = Demands[node] * timeAtServiceLocation;
  }

  for (int i = 0; i < vehicles.Count(); ++i)
  {
      VehicleDetails vehicle = vehicles[i];
  
      if (vehicle.Breaks != null)
      {
	      var jsonBreaksArr = JsonConvert.DeserializeObject<List<Dictionary<string, TimeSpan>>>(vehicle.Breaks);
	      jsonBreaksArr.ForEach(breakVal =>
	      {
		      DateTime breakStartTime = DateTime.Today.Date.Add(breakVal["startTime"]);
		      DateTime breakEndTime = DateTime.Today.Date.Add(breakVal["endTime"]);
  
		      startTimeSpan = breakStartTime.AddMinutes(0).TimeOfDay;
		      endTimeSpan = breakEndTime.AddMinutes(0).TimeOfDay;
  
		      long breakStart = (long)startTimeSpan.TotalSeconds;
		      long breakEnd = (long)endTimeSpan.TotalSeconds;
		      long duration = breakEnd - breakStart;
  
		      IntervalVar breakInterval = solver.MakeFixedDurationIntervalVar(breakStart, breakStart, duration, true, "Break" + i);
		      breaks.Add(breakInterval);
	      });
	      timeDimension.SetBreakIntervalsOfVehicle(breaks, i, node_visit_transit);
      }
  }

This code snippet for breaks is written based on the code mentioned in the below link,
https://github.com/google/or-tools/blob/v6.0/examples/cpp/cvrptw_with_breaks.cc#L134.

One thing that "SetBreakIntervalsOfVehicle" method in C# is expecting is "node_visit_transit" which is not mentioned in the above C++ solution.
Populated node_visit_transit using the logic defined below,
https://github.com/google/or-tools/blob/stable/ortools/constraint_solver/samples/cvrptw_break.py#L291.

I expect no service to be allocated to vehicle 1 between the break hours (Break interval 1: Between 11:00 and 12:00, Break interval 2: Between 19:00 and 21:00).

But instead I can see the allocation at 20:00 which overlaps with second break interval.

Additional details:
I have added penalty to my routing object as below,

    private long penalty = 2_000_000_000_000_000_000;
for (int i = vehicles.Count; i < TimeWindows.GetLength(0); ++i)
{
	routing.AddDisjunction(new long[] { manager.NodeToIndex(i) }, penalty);
}

Any advice on the above would help.