Reproduction steps: 1. Setup generic LDAP user repository (RW), with jira-users, jira-developers, jira-administrators groups. 2. Create user for John Smith as email@example.com. 3. Add him to jira-administrators group. 4. Remove user firstname.lastname@example.org (John changed the company). 5. Create user for Jake Sunny as email@example.com.
Result: newly hired Jake Sunny is administrator, now.