The issues filed in the project you referenced are thought of as being 'archived' and therefor off our radar. This issue was no different. The issue predates the Tinder project, but is a perfect candidate to be moved into that project. This is what I just did: the issue is now known as TINDER-32 (although the old Jira references should continue to work).
Thanks for bringing this one to our attention (again). I'll write a unit test and commit a fix hopefully later today.
Out of curiosity: did you run into this bug in practise? If so, could you share some of the details of your application of XMPP?