Unable to assign ticket to a user when creating an issue if the Assignable User permission is set to a user or group picker custom field

Issue Summary

Unable to assign the ticket to a user when creating an issue if the Assignable User permission is set to a user or group picker custom field

Steps to Reproduce

1. Visit /CreateIssue.jspa
   • https://<site-name>.atlassian.net/CreateIssue.jspa
2. Choose a project where the Assignable User project permission is set to a Group or User picker custom field.
3. On the next page, enter a value into that Group or User picker custom field:
4. Attempt to select a user in the assignee field.

Expected Results

The Assignee field shows the user's list as per the selected Group or User picker custom field.

Actual Results

The Assignee field doesn't show the user's list and only shows the below option:

1. Unassigned
2. Automatic

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available.