REST API Threading doesn't work for reviews

Hi there.

I want to retrieve a threaded list of Reviews (Message with a Rating object). I found the documentation to this feature: Understanding linear and threaded sorting in REST API.

But when I try calling this route ("threaded"), I get an error:

https://community.client.ch/restapi/vc/threads/id/123/messages/threaded?restapi.format_detail=full_list_element

<response status="error">
    <error code="100">
        <message>Ein unerwarteter Fehler ist aufgetreten.</message>
    </error>
</response>

When I call "linear", I get a linear list of reviews, as expected. (but of course, no comments/replies)

https://community.client.ch/restapi/vc/threads/id/123/messages/linear?restapi.format_detail=full_list_element

Any ideas? Bug?

Thanks for your help!