When fetching data, it follows redirects: values fetched correspond to the target element of a redirect. If a Qid is used raw, not for fetching its data but for comparison purposes as in a filter, then a Qid redirected may provoke unexpected results. This may affect function claim with parameters whitelist, blacklist, selectvalue or ignorevalue, and function getParentValues with parameters uptolabelid, uptovalueid, showlabelid.