There are two occurrences of the wrong message being logged:
https://github.com/mongodb/mongo/blob/r3.5.6/jstests/concurrency/fsm_workloads/sharded_moveChunk_partitioned.js#L132
https://github.com/mongodb/mongo/blob/r3.5.6/jstests/concurrency/fsm_workloads/sharded_moveChunk_partitioned.js#L145