`only_annotated` in `/api/tasks` does not work as expected

Label Studio Community v1.20.0

`/api/tasks?project=1&fields=all&only_annotated=true` returns all tasks instead of only annotated tasks

This returns only annotated tasks:

`/api/tasks?project=1&fields=all&query={"filters":{"conjunction":"and","items":[{"filter":"filter:tasks:total_annotations","operator":"greater","type":"Number","value":0}]}}`