Not able to create issue with multiple assignees using API

Version: GitLab Enterprise Edition 11.11.3-ee and GitLab Community Edition 11.5.4

Action: Create a new issue and assign it to multiple assignees using API.

Worklog: Attachedgitlab_api_issue_found screenshot

Expected Result: Issue assigned to all the IDs given in payload

Actual Result: Issue getting assigned to only one random ID from list of IDs.

Edited by Chitra Hegde