Can't get list of all Parent fields using /rest/api/2/jql/autocompletedata/suggestions

Hello,

After some updates related to the Parent autocomplete suggestions stopped working to get list of all Parents.

API documentation says that when you pass fieldName only you should get a list of all items, but it doesn’t work for parent anymore.

I’m using /rest/api/2/jql/autocompletedata/suggestions?fieldName=parent to get a list of all parent issues. And it works for other fields but not for the parent. Only adding a fieldValue will return some results

Is this something that will be fixed?