The LiveData script service query() method doesn't honor the "sourceParameters" parameter

{{liveData
  id="users"
  properties="_avatar,doc.name,first_name,last_name"
  source="liveTable"
  sourceParameters="className=XWiki.XWikiUsers&translationPrefix=xe.userdirectory."
/}}

{{velocity}}
#set ($properties = {
  'id' : 'users',
  'properties' : '_avatar,doc.name,first_name,last_name',
  'source' : 'liveTable',
  'sourceParameters' : "className=XWiki.XWikiUsers&translationPrefix=xe.userdirectory."
})
$services.liveData.query($properties)

{{html}}
  $services.liveData.render($properties)
{{/html}}
{{/velocity}}