manage_user_update.php doesn't check that user is LDAP so the page isn't sent updated values for email and real name.

$f_email and $f_realname are therefor blank. As a workaround, I added the following code to get the correct values from LDAP before the database update:

if ( config_get( 'use_ldap_realname' ) == ON ) {
$c_email = user_get_email( $f_user_id );
$f_email = $c_email;
$c_realname = user_get_realname( $f_user_id );
}