Teamcity Bazaar and sftp

I'm trying to get TeamCity to work with a remote Bazaar repo over sftp using username and password. I am using the bzr4j (version 2.4.3) plugin as detailed at http://youtrack.jetbrains.com/issue/TW-7914 to provide support for bazaar in Teamcity.

Using any command line, I can connect to the remote repo via sftp and get the expected response e.g.

bzr info sftp://username@host
Connected (version 2.0, client 9.99)
SSH username@host password: (password here)
Authentication (password) successful!
Secsh channel 1 opened.
[chan 1] Opened sftp connection (server version 3)
Shared repository (format: 2a)
Location:
  shared repository: sftp://username@host/

When doing this from within TeamCity however, it looks as though a connection is established correctly, but it is being interpreted as a connection error e.g.

Exit value: 0 ; Working dir: 
"c:\TeamCity\bin"
--- STDERR ---
Connected (version 2.0, client 9.99) 

Authentication (password) successful! 
Secsh channel 1 opened. 
[chan 
1] Opened sftp connection (server version 3) 

---- ARGS 
----
bzr
revno
--no-aliases
sftp://username:password@host
-------------- 

This looks like an issue with bzr4j to me, but I'm not sure. Has anyone had any success with getting Bazaar working over sftp with TeamCity?