Trying to add layers from GeoNode CSW catalog (based on PyCSW implementation by default)

e.g.: http://demo.geonode.org/catalogue/csw?outputschema=http%3A%2F%2Fwww.opengis.net%2Fcat%2Fcsw%2F2.0.2&service=CSW&version=2.0.2&request=GetCapabilities

The list of records seems to be parsed correctly (even though previews do not work and often pagination does not work correctly), but adding a Layer seems to be broken somehow. The generated WMS request does not contain LAYERS query param at all or a "null" workspace is assigned to the layer.