Replicator could lose the previously set progressLevel

The following scenario could cause the progress level to set back to overAll.

1. Create a continuous push-pull (or push only) replicator.
2. Start then stop after IDLE.
3. Add some documents to the database.
4. Add document replication listener to the replicator
5. Start the replicator again.
6. There should be some document replication events notified.

What happens:

1. No document replication events notified.
2. It seems like the progress level is not preserved.