In version 2.0.4 the git push command looks like (omit some options):
git push -v origin master:refs/for/master

In 2.0.5, it looks like:
git push -v origin refs/heads/master:refs/heads/refs/for/master,
which is treated by Gerrit as a request to push directly to that branch. Users who do not have permission to push to refs/heads or create branches (refs/heads/refs/for/* usually doesn't exist) get an error and are not able to push their patchset.