wrong recipient address in bounce message

Today I got a bounce message from chipmonk (I believe there's some testing deployment in the mx there). However, the bounce message seems to have got the recipient address wrong (it displays the sender address instead).

Delivery to the following recipient failed:
    kali@xxx.net

Reasons:
    Missing UUID: There was a problem locating the user in our database.

Original message:
    Return-Path: 
X-Original-To: test_sync_200@cdev.bitmask.net
Delivered-To: test_sync_200@cdev.bitmask.net
Received: from mx1.riseup.net (mx1.xxx.net [xx.xx.xx.xx]

(from redmine: created on 2015-04-13, closed on 2015-04-13, relates #6858 (closed))

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