1, Created User Demo1
2. With Elastic User , i was able to see all the 3 users (Demo1/Dummy/Elastic)
3. Deleted the Demo1 user from Kibana
4. Logged Out & Logged In again with Elastic
5. In Screen Security > Alerts > Assignees > Can still see user Demo1
6. I thought it maybe due to Assigned Alerts on this username because of which in the dropdown we were able to see the user
7. Even unassigned and saw that no alerts was assigned to user Demo1
8. Logged out & Logged in again still User is visible
9. Tried restarting Elasticsearch/Kibana as well but user is visible.
As per above performed steps it seems to be a bug as i see the same behavior as reported by you.
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