I can't comment directly on this, but I've run into issues with aliases and CalDAV in the past, to the point that I avoid creating aliases on our ZCS. Instead I create single-user distro lists.
Reviewing bugzilla, it looks like
one of those issues has been fixed as of 7.1.1. So I'd suggest first upgrading to that (or wait for 7.1.2), and then if you still see the problem, please open a report in bugzilla and post the bug # here.