Weird RavenDb Spatial query behavior

RavendbSpatial.cs

[Fact]
        public void WithinRadiusOf_NamedSpatialField()
        {
            Session.Advanced.DocumentStore.ExecuteIndex( new NamedSpatialFieldIndex() );

            var obj = new ClassWithLocation()
            {
                Id = "obj/1",
                Location = new Location( 10.0, 11.0 )
            };
            Session.Store( obj );
            Session.SaveChanges();


            var namedLuceneQuery = Session.Advanced
                .LuceneQuery<ClassWithLocation, NamedSpatialFieldIndex>()
                .WithinRadiusOf( "Location", 1.0, 10.0, 11.0 )
                .WaitForNonStaleResults()
                .ToList();

            Assert.Single( namedLuceneQuery );

            var linqQueryWithSpatial = Session.Query<ClassWithLocation, NamedSpatialFieldIndex>()
                .Spatial( x => x.Location, x => x.WithinRadiusOf( 1.0, 10.0, 11.0 ) )
                .Customize( x => x.WaitForNonStaleResults() )
                .ToList();

            Assert.Empty( linqQueryWithSpatial ); // for some reason this doesn't work

            var linqQueryWithCustomize = Session.Query<ClassWithLocation, NamedSpatialFieldIndex>()
                .Customize( x => x.WithinRadiusOf( "Location", 1.0, 10.0, 11.0 ) )
                .Customize( x => x.WaitForNonStaleResults() )
                .ToList();

            Assert.Single( linqQueryWithCustomize ); // this works
        }

        class ClassWithLocation : IAggregateRoot
        {
            public string Id { get; set; }
            public Location Location { get; set; }
        }

        class ClassWithLocationReduceResult
        {
            public string Id { get; set; }
            public Location Location { get; set; }
        }

        class NamedSpatialFieldIndex : AbstractIndexCreationTask<ClassWithLocation, ClassWithLocationReduceResult>
        {
            public NamedSpatialFieldIndex()
            {
                Map = docs => from d in docs
                              select new ClassWithLocationReduceResult()
                              {
                                  Id = d.Id,
                                  Location = (Location)SpatialGenerate( "Location", d.Location.Latitude, d.Location.Longitutde )
                              };
            }
        }