When I add pbb-rewrite to interface:
PUT /restconf/config/ietf-interfaces:interfaces/interface/GigabitEthernet0%2F8%2F0/pbb-rewrite
{"pbb-rewrite": {"i-tag-isid": "12", "interface-operation": "pop-2", "destination-address": "bb:bb:bb:bb:bb:bc", "b-vlan-tag-vlan-id": "2223", "source-address": "aa:aa:aa:aa:aa:ab"}}

and then try to read oper data:
GET /restconf/operational/ietf-interfaces:interfaces-state
...there is no pbb-rewrite container present in any of the interfaces.

The log says:
FlatWriterRegistry - Update successful for: ... ... interfaces._interface.PbbRewrite
dataBefore=null, dataAfter=PbbRewrite{getBVlanTagVlanId=2223, getDestinationAddress=MacAddress [_value=bb:bb:bb:bb:bb:bc], getITagIsid=12, getInterfaceOperation=Pop2, getSourceAddress=MacAddress [_value=aa:aa:aa:aa:aa:ab], augmentations={}}}]}, deletes={}}
...
...
[PbbRewriteState]: Current node read successfully. Result: Optional.absent()
[PbbRewriteStateInterfaceAugmentation]: Current node read successfully. Result: Optional.absent()