Once having upgraded to Nuxeo 5.7.1 on 20130708, DocumentServiceTest.testModelCreation() got broken in the process, which had been until now perfectly working.
It first calls a business method that does a createDocument() and a save() (maybe some more stuff like listeners setting properties or moving it), then tries to find it using an NXQL query on a business id property, which fails.
WORKAROUND However, doing an NXQL query on its ecm:uuid technical id succeeds in returning it, and subsequent queries done on said business id then do work. And as far as I can tell, there's no hidden exception been thrown in between.
This smells some caching problem (in VCS ??)...
UPDATE 20130718 works again without workaround and with no further upgrade (??)