Network interruption causes WaitForUpdatesEx blocking issue

The following code retrieves a list of host objects every 10 seconds. For my test, I run this code on my laptop inside of a VMware Workstation Ubuntu VM. This allows me to use VMware Workstation to simulate a break in network connectivity (adapter is up, but client is unable to communicate with vSphere).

1. Allow the code to run for a few cycles (2-3 is enough).
2. Uncheck 'VM/Settings/Network Adapter' to simulate a break in network connectivity.
3. Wait 30 seconds - observe that 'Waiting for updates' does not show any updates or errors
4. Re-enable 'VM/Settings/Network Adapter' to restore network connectivity
5. Observe that 'Waiting for updates' does not show any further updates or errors.

    from pyVim.connect import SmartConnect
    import pyVmomi

    def test_loop(username, password, host, port):
        # Connect and collect instance info
        service_instance = SmartConnect(user=username, pwd=password, host=host, port=port)
        content = service_instance.RetrieveContent()

        # Create a container view
        container_view = content.viewManager.CreateContainerView(
            container=content.rootFolder,
            type=[pyVmomi.vim.HostSystem],
            recursive=True)

        # Create a traversal spec
        traversal_spec = pyVmomi.vim.PropertyCollector.TraversalSpec(
            name='traversal_spec',
            path='view',
            skip=False,
            type=pyVmomi.vim.view.ContainerView)

        # Create an object spec
        object_spec = pyVmomi.vim.PropertyCollector.ObjectSpec(
            obj=container_view,
            selectSet=[traversal_spec],
            skip=False)

        # Create a property specs for host events
        property_spec_host_events = pyVmomi.vim.PropertyCollector.PropertySpec(
            all=False,
            pathSet=["runtime.bootTime"],
            type=pyVmomi.vim.HostSystem)

        # Create a property filter spec
        property_filter_spec = pyVmomi.vim.PropertyCollector.FilterSpec(
            objectSet=[object_spec],
            propSet=[property_spec_host_events],
            reportMissingObjectsInResults=True)

        # Create the property filter
        content.propertyCollector.CreateFilter(
            spec=property_filter_spec,
            partialUpdates=True)

        # Set up the wait options
        max_wait = 10
        wait_options = pyVmomi.vim.PropertyCollector.WaitOptions(
            maxWaitSeconds=max_wait,
            maxObjectUpdates=None)

        # Initialize update version and start time
        update_version = None

        # Loop until exit flag has been set
        while True:

            print("Waiting for updates from (v {})...({} seconds)".format(
                update_version,
                wait_options.maxWaitSeconds))

            # Block until an update is received or timeout is received
            update_set = content.propertyCollector.WaitForUpdatesEx(
                version=update_version,
                options=wait_options)

            if update_set is None:
                print("Timeout/Requery")

                # Reset the update version number to force a full requery.
                update_version = None

            else:
                print("  Received Update (v{})".format(update_set.version))
                update_version = update_set.version

            print("")

    # Run the test.
    test_loop('root', 'password', 'localhost', 443)