GC affects Proxied Shared Object?

Hi, all

I found sth strange with the Proxied Shared Object when Garbage Collection in FMS 4.0. I have a FMS application 'ProxiedSOApp', in the Application start, it tries to get proxied SO from another FMS application 'MasterSOApp' every 5 seconds, and GC runs every 20 seconds.

application/MasterSOApp/main.asc

application.allowDebug=true;
var so;
application.onAppStart = function( ){
 so=SharedObject.get('MasterSO',false);
 so.setProperty('Cabinet','Cabinet');};
application.onAppStop = function(){
 trace('Application', 'Stopped.');}; 

application/ProxiedSOApp/main.asc

application.allowDebug=true;
var nc;
var soRef;application.onAppStart = function( ){
 trace('Application', 'Started.');
 nc = new NetConnection(); 
 nc.connect('rtmp://localhost/MasterSOApp', "console" );
 nc.onStatus = function(info) {  trace(info.code);};
 nc.isAlive = function(){  returntrue;};
 setInterval( updateSORef , 5000 );
 setInterval( doGC , 20000 );};
function doGC(){
 trace('GC working');
 application.gc();}
function updateSORef(){
 trace('updateSORef');
 soRef=SharedObject.get('MasterSO',false,nc);
 soRef.onSync=function(list) {  trace('sync begin');  for (var i = 0; i < list.length; i++)   {   trace('SO status: '+list[i].code+': '+list[i].name);   }  trace('sync end');};}
application.onAppStop = function(){
 trace('Application', 'Stopped.');}; 

And I found the logs of ProxiedSOApp below

#Fields: date time x-pid x-status x-ctx x-comment
2012-11-13 14:48:26 13316 (s)2641173 ApplicationStarted.  -
2012-11-13 14:48:26 13316 (s)2641173 NetConnection.Connect.Success -
2012-11-13 14:48:31 13316 (s)2641173 updateSORef -
2012-11-13 14:48:31 13316 (s)2641173 sync begin -
2012-11-13 14:48:31 13316 (s)2641173 SO status: clear: undefined -
2012-11-13 14:48:31 13316 (s)2641173 SO status: change: Cabinet -
2012-11-13 14:48:31 13316 (s)2641173 SO status: change: DataRetrieve -
2012-11-13 14:48:31 13316 (s)2641173 SO status: change: User -
2012-11-13 14:48:31 13316 (s)2641173 SO status: change: UserSession -
2012-11-13 14:48:31 13316 (s)2641173 sync end -
2012-11-13 14:48:36 13316 (s)2641173 updateSORef -
2012-11-13 14:48:41 13316 (s)2641173 updateSORef -
2012-11-13 14:48:46 13316 (s)2641173 GC working -
2012-11-13 14:48:46 13316 (s)2641173 sync begin -
2012-11-13 14:48:46 13316 (s)2641173 SO status: clear: undefined -
2012-11-13 14:48:46 13316 (s)2641173 sync end

...

Although the proxied SO is updated during the 1st get, when GC works, the proxied SO is cleared.(the Master SO is unchanged)

So I want to know, when GC, is there sth happened with the unreachable proxied SO reference which will clear the SO?

Thanks!