Unable to get list items from top level container

Given a YANG module with a top-level container consisting solely of a description and a list, I can get the whole list using:

http://host:port/restconf/configuration/opendaylight-inventory:nodes/node/node-name/yang-ext:mount/module-name:container-name/

But if I try to get an individual entry using:

http://host:port/restconf/configuration/opendaylight-inventory:nodes/node/node-name/yang-ext:mount/module-name:container-name/list-name/key

I get

<list-name/>

(using XML)

or

{
"list-name": [
{}
]
}

(using JSON)

This was working in previous releases of the controller (e.g. a release from May 13th).

I've tried it with 2 different YANG modules, one with a simple key and one with a compound key. Either way it fails