Adding deleted netconf node back in fails

If I add a node using a POST to:

/restconf/config/opendaylight-inventory:nodes/node/controller-config/yang-ext:mount/config:modules

and then delete it using DELETE of

/restconf/config/opendaylight-inventory:nodes/node/foo

then I am unable to add the node back in again.

I've also found that if I do a ./stop and a ./start clean then any nodes I've added and then deleted appear again once I load the netconf and restconf features.

I'm guessing this is one bug rather than two.