DataChangeScope.ONE does not work in registerDataChangeListener

if I register a listener like this:
dataProvider.registerDataChangeListener(LogicalDatastoreType.CONFIGURATION, InstanceIdentifier.builder(Nodes.class).child(Node.class).build(), new NodesConfigListener(), DataChangeScope.ONE)

and I PUT data to DS:
http://localhost:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/node-connector/com:nodeconnector
{
"opendaylight-inventory:node-connector": [

]
}

the listener does not get a data change event.

btw, If I do GET on node "openflow:1" I can see the node connector "com:nodeconnector" is in datastore.