[JRACLOUD-63554] Scrolling down list of users in the "Assign Issue" dialog results in duplicate users appearing (Edge case)

NOTE: This bug report is for JIRA Cloud. Using JIRA Server? See the corresponding bug report.

This is the edge case of ~~JRA-44113~~.
~~JRA-44113~~ has already been closed but the problem sill occurred in the following scenario.

Create 15-20 users, ensure all of them are able to be assigned issues (you need enough users to cause the user list in the Assign Issue dialog to have to scroll).
Assign 2-3 users you created in Step 1 to some tickets to make them appear in Suggestion section in the assignee list. (Please check this KB to understand how the suggestions are calculated.)
Please make sure the 2-3 users are not in the end of All Users list.
Click Assign, then hit the dropdown arrow in the Assignee field.
Scroll down (using the keyboard or trackpad/mouse, it doesn't matter) to the bottom of the list.

You reach the bottom of the user list and there's no duplicates.

There are some duplicate in the user list.

Currently there's no workaround, but this issue is purely cosmetic.

is cloned from

JRACLOUD-44113 Scrolling down list of users in the "Assign Issue" dialog results in duplicate users appearing

is related to

JRASERVER-63554 Scrolling down list of users in the "Assign Issue" dialog results in duplicate users appearing (Edge case)

No work has yet been logged on this issue.