RavenDB "caching" not existing documents

gistfile1.cs

using System.Linq;
using Raven.Client.Embedded;
using Raven.Database.Extensions;

namespace etobi.RavenDB2Test01
{
    public class Program
    {
        private static EmbeddableDocumentStore _documentStore;

        static void Main(string[] args)
        {
            IOExtensions.DeleteDirectory("Data");
            using (_documentStore = new EmbeddableDocumentStore
            {
                Configuration =
                {
                    DataDirectory = "Data",
                },
            })
            {
                _documentStore.Initialize();
                using (var session1 = _documentStore.OpenSession())
                {
                    var foo = session1.Load<Foo>("foos/1");
                    using (var session2 = _documentStore.OpenSession())
                    {
                        session2.Store(new Foo { Id = "foos/1", Name = "Something"});
                        session2.SaveChanges();
                    }
                    foo = session1.Load<Foo>("foos/1");
                    // foo is still null here

                    foo = session1.Query<Foo>().FirstOrDefault();
                    // This actually returns foo
                }

            }
        }
    }

    public class Foo
    {
        public string Id { get; set; }
        public string Name { get; set; }
    }
}