[MarkLogic Dev General] does cts:contains work with registered queries?

[Whitby, Rob, Springer Healthcare UK]

I'm trying to use cts:contains with a registered query, but it always seems to 
return true (ML 5.0-1). Any ideas?

Thanks, Rob

xdmp:document-insert("/test.xml", <test/>)
;
let $doc := fn:doc("/test.xml")
let $query := cts:or-query(())  (: match nothing :)
let $reg-query := cts:registered-query(cts:register($query), "unfiltered")
return (
  cts:contains($doc, $query),
  cts:contains($doc, $reg-query),
  xdmp:exists(cts:search(/test, $reg-query, "unfiltered"))
)

=>
false
true
false

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