User cannot be found for role assignment after a directory change

Summary

A user is a member of two LDAP connector type user directories (i.e. LDAP1 and LDAP2) defined on same Jira instance. A user is discovered from the first of these directories according to the order of directory definition (LDAP1). When we delete this user from LDAP1, Jira discovers the user from the second directory (LDAP2) just fine. The user can be searched for, added to local groups, however, cannot be added to a project role.

Steps to Reproduce

• We can't reproduce this on a vanilla Jira installation
• Reproduced reliably at client instance.

Expected Results

• After being disabled on LDAP1, the user, as discovered from LDAP2 with the same username (which was shadowed before) shall be available for project role assignments.

Actual Results

• User cannot be assigned to a project role (see attached images)
  

Workaround

• Restarting the server.