select from keyspaces shows a fetch value of "\u003cnil\u003e" with couchbase, memcached buckets present

1. create a memcached bucket - not supported for n1ql
2. query the system catalog tables :
select * from system:keyspaces
cbq> select * from system:keyspaces;
{
"requestID": "64b56da2-8755-44d1-a393-cbec5f6c52f1",
"signature":

{ "*": "*" }

,
"results": [
],
"errors": [

{ "code": 5030, "msg": "Invalid fetch value \u003cnil\u003e of type %!T(MISSING)" }

],
"status": "stopped",
"metrics":

{ "elapsedTime": "180.847729ms", "executionTime": "180.491707ms", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}

This error should be " not supported bucket type memcached"

2.Drop the above bucket and create other couchbase buckets.
3. Query system :keyspaces, it still shows the above result and does not detect the new keyspaces - which is odd.

4. kill, restart the cbq client on the node and issue the above command,
Still see the same error.

Added logs.
Adding this as a script shortly. and this is easy to repro.