Ix Publish Bug?

Output

Ix
{ left = 0, right = 2 }
{ left = 1, right = 3 }
{ left = 2, right = 4 }

Rx
{ left = 0, right = 1 }
{ left = 1, right = 2 }
{ left = 2, right = 3 }
{ left = 3, right = 4 }

Program.cs

using System;
using System.Linq;
using System.Reactive.Linq;

namespace Rxx.Labs.Bugs
{
  static class IxPublishBugLab
  {
    static void Main()
    {
      Console.WriteLine("Ix");
      
      var xs = Enumerable.Range(0, 5);
      var ys = xs.Publish(p => p.Zip(p.Skip(1), (left, right) => new { left, right }));
      ys.ForEach(Console.WriteLine);

      Console.WriteLine();
      Console.WriteLine("Rx");

      var js = Observable.Range(0, 5);
      var ks = js.Publish(p => p.Zip(p.Skip(1), (left, right) => new { left, right }));
      using (ks.Subscribe(Console.WriteLine))
      {
        Console.ReadKey();
      }
    }
  }
}