Inventory Traversal not traversing

This is a question about Inventory Traversal. The code below returns values for vim.VirtualMachine and vim.Network. But they are each an individual vmodl.query.PropertyCollector.ObjectContent

I would have thought that the vim.Network values would have been a subset of each vim.VirtualMachine.

Does anyone know how to do write this so that the properties of the vim.Network are listed as properties of each vim.VirtualMachine that they belong to?

    objView = content.viewManager.CreateContainerView(content.rootFolder,
                                                      [vim.VirtualMachine],
                                                      True)

    collector = content.propertyCollector

    obj_spec = vmodl.query.PropertyCollector.ObjectSpec()
    obj_spec.obj = objView
    obj_spec.skip = True

    traversal_spec = vmodl.query.PropertyCollector.TraversalSpec()
    traversal_spec.name = 'traverseEntities'
    traversal_spec.path = 'view'
    traversal_spec.skip = False
    traversal_spec.type = vim.ContainerView
    obj_spec.selectSet.append(traversal_spec)

    traversal_spec_nw = vmodl.query.PropertyCollector.TraversalSpec()
    traversal_spec_nw.type = vim.VirtualMachine
    traversal_spec_nw.path = 'network'
    traversal_spec_nw.skip = False

    traversal_spec.selectSet.append(traversal_spec_nw)

    property_spec = vmodl.query.PropertyCollector.PropertySpec()
    property_spec.type = vim.VirtualMachine
    property_spec.pathSet.extend(['name', 'guest.hostName'])

    property_spec_nw = vmodl.query.PropertyCollector.PropertySpec()
    property_spec_nw.type = vim.Network
    property_spec_nw.pathSet.append('summary.accessible')

    filter_spec = vmodl.query.PropertyCollector.FilterSpec()
    filter_spec.objectSet.append(obj_spec)
    filter_spec.propSet.append(property_spec)
    filter_spec.propSet.append(property_spec_nw)

    props = collector.RetrieveContents([filter_spec])
    pprint.pprint(props)

Start with the PropertyCollector ObjectSpec, TraversalSpec, and PropertySpec entry points shown in the issue, then inspect how RetrieveContents handles objects reached through multiple traversal paths. Verify the resulting ObjectContent structure and determine what behavior would associate network properties with each virtual machine; document the confirmed limitation or required change.