Topology data change event does not provide link removal data

I am trying to listen to MD-SAL topology changes, specifically creation and removal of links.

I register my listener for Links like following -

dataService.registerDataChangeListener(
InstanceIdentifier.builder(NetworkTopology.class).child(Topology.class, new TopologyKey(new TopologyId("flow:1")))
.child(Link.class).toInstance(), new TopologyListener());

Where my TopologyListener class, which implements DataChangeListener looks like following -

public class TopologyListener implements DataChangeListener{

@Override
public void onDataChanged(
DataChangeEvent<InstanceIdentifier<?>, DataObject> change)

{ Map<InstanceIdentifier<?>, DataObject> linkCreated = change.getCreatedOperationalData(); Set<InstanceIdentifier<?>> linkRemoved = change.getRemovedOperationalData(); }

Now, when a link is removed, change.getRemovedOperationalData() does not have data, its empty Set.

It should have removed link data