Description of problem:


The rh bz xmlrpc function Flag.update() can not update attachment flag, although its documentent states "allows you to update flag (including attachment's flag) for one or more bugs."


Steps to Reproduce:
1.call the Flag.update() function like
$call = $bz_rpc->call( 'Flag.update', {
        ids => [$bug_id],
        updates => [{
            name => $new_name,
            status => $new_status,
            attach_id => $attach_id,
            
        } ]
    });

  
Actual results:
The attachment flag is not updated

Expected results:
The attachment flag should be updated to the new status value


Additional info:
Updating bug flags works well.