Synchronize -download fails to sftp

[btully]

I am trying to synchronize files from a customer's server via sftp. I can download manually in CyberDuck fine, but using the cli I get an error of "Transfer incomplete…". No file gets retrieved. I am able to upload properly calling duck from a Python script. It is only the download synchronize that fails, either directly from CLI or when called by Python.

Does the synchronize command require a minimum age of FTP to work properly? Are there certain commands that the server needs to understand in order to work?

I am using 6.3.0.

[btully]

Using Cyberduck, Version 6.2.9 (26659), is able to sync/download from the same FTP server.

[btully]

changed settings in brew to use "iterate-ch" version of duck, rather than default setting and now the command line works properly. version 6.3.0.26768

[btully]

False positive. Even after the update to 6.3.0.26768 the synchronize command fails.

[btully]

If synchronize command is not yet stable, is it possible to initiate mounting a file with Mountain Duck from the command line? Then I could use rsync instead.