Openfire 4.5.1 admin group is not synchronized with LDAP after adding new user to the group

After creating a new user which belongs to admin group; LDAP and Openfire server are synchronized but “administrator” field is not synchronized automatically with admin group without restarting the server.

Following OFPROPERTY values have been set:
provider.group.groupBasedAdminProvider.groupName=XXX
ldap.groupDescriptionField=description
ldap.groupMemberField=memberUid
ldap.groupNameField=cn
ldap.groupSearchFilter=(&(objectClass=IDMGroup)(objectclass=extensibleObject))
provider.group.className=org.jivesoftware.openfire.ldap.LdapGroupProvider
ldap.autoFollowAliasReferrals=true
ldap.autoFollowReferrals=false
ldap.baseDN=dc=XXX,dc=XXX,dc=XXX,dc=XXX
ldap.connectionPoolEnabled=true
ldap.debugEnabled=false
ldap.emailField=mail
ldap.encloseDNs=true
ldap.host=ldaphost
ldap.ldapDebugEnabled=false
ldap.nameField={cn}
ldap.override.avatar=false
ldap.port=XXX
ldap.posixMode=true
ldap.searchFields=Username/uid,Name/cn,Email/mail
ldap.searchFilter=(&(objectclass=person)(objectclass=IDMPerson))
ldap.sslEnabled=false
ldap.startTlsEnabled=false
ldap.usernameField=uid