Comment 3 for bug 1661551

It is possible that the version of the openstacksdk used here will have some bearing on compatibility. All Neutron commands call into the SDK and not neutronclient. However it is more likely that this is due to some change in the Neutron API that OSC simply does not know about. Much of the Neutron support is only a year or so old and may not have been written with compatibility with older APIs in mind, it certainly has not been tested against Liberty code in quite some time.

Comparing the data returned between your debug output and my current Neutron-based DevStack cloud shows a lot of additional fields included, so I'd say OSC is assuming some fields are present and attempting to format them, specifically a list, and failing when the field does not exist.