Issue Summary

In Jira, the Assignee field dropdown does not consistently display the full list of available users when assigning tickets. Although there are several users with access to the project and issues assigned in an Agile Board, the dropdown sometimes fails to populate with all possible assignees. While sometimes the dropdown is fully populated, at other times it only shows limited options, such as the current user, "Unassigned," and "Automatic."

Steps to Reproduce

1. Log in to the affected Jira instance.
2. Navigate to a project board 
3. Open an issue from the board.
4. Click on the Assignee field.
5. Observe the list of options displayed in the dropdown.

Expected Results

The Assignee dropdown should immediately display all available users who can be assigned issues in the project, without requiring the user to type part of the name to find them.

Actual Results

The Assignee dropdown sometimes shows only a limited set of options, not including all potential assignees. Users need to start typing a name to locate and assign a ticket to someone not listed initially.

Workaround

As a workaround, users can start typing the desired user's name in the Assignee field, which will then display matching users and allow selection.