Dashboard: Merge Requests select by approver not working as expected

When using merge request dashboard, e,g.:

https://gitlab.com/dashboard/merge_requests?scope=all&utf8=%E2%9C%93&state=opened&approver_usernames[]=steineldar

SHOWN:

It's my observation that it shows merge requests where approver_usernames[] exacly matches merge request approvers list.

EXPECTED:

Should show all merge requests where all of (approver_usernames[]) are present.