DataChangeListener or DataTreeChangeListener does not get data change event if is registered with instance-identifier containing unkeyed list.

Yang used in cases below:
container con1 {
list list1 {
key "list1key";
leaf list1key

list unkeyed-list {
leaf this-is-not-key

list list2 {
key "list2key";
leaf list2key

}
}
}
}

Case 1:
DataTreeChangeListener is registered with IID:
InstanceIdentifier.builder(Con1.class).child(List1.class).child(UnkeyedList.class).child(List2.class).build();
The listener does not get notification when instance of list2 is created.

Case 2:
DataTreeChangeListener is registered with IID:
InstanceIdentifier.builder(Con1.class).child(List1.class).child(UnkeyedList.class).build();
The listener does not get notification when instance of list2 or instance of unkeyed-list are created.

CONTROLLER-1:
InstanceIdentifier.builder(Con1.class).child(List1.class).build();
The listener does not get notification when instance of list2 or instance of unkeyed-list are created but it get notification when instance of list1 is created.

Also DataObjectModification representing unkeyed-list never contains modified children.