The JQL functions parentIssuesFromQuery() and parentIssuesFromFilter() do not return results.
Below is how I am trying them:
issue in parentIssuesFromQuery("project = PXP AND issuetype = Story")
When I try a new search with the query string "project = PXP AND issuetype = Story", it returns results.
The same with the function parentIssuesFromFilter(). I use the named filter as parameter.