Not my vbucket error during rebalance

This error is seen when updates are done during swap rebalance: 
06:37:14 [2020-05-27 06:37:14,584: WARNING/Process-3:17] Function: do_update_durable, error: <Key='6cb167-000006283702', RC=0x40E[LCB_ERR_NOT_MY_VBUCKET (1038)], Operational Error, Results=1, C Source=(src/multiresult.c,316), Context={'cas': 0, 'endpoint': '172.23.96.103:11210\x00', 'type': 'KVErrorContext', 'key': '6cb167-000006283702', 'opaque': 39720, 'collection': '_default', 'context': '', 'status_code': 7, 'bucket': 'bucket-1', 'ref': '', 'scope': '_default'}, Tracing Output={"6cb167-000006283702": {"debug_info":

}}>
This is the job: http://perf.jenkins.couchbase.com/job/titan-durability/85/consoleFull

Logs are at the bottom of the job link.

Not sure if this is expected, but opening it in case its a bug.