io.js worker disconnect bug

demo.js

var cluster = require('cluster'),
   net = require('net');

if (cluster.isMaster) {
   console.log('Master started');

   cluster.fork();

   // Wait 10sec and disconnect worker
   setTimeout(function(){
      Object.keys(cluster.workers).forEach(function(id) {
         console.log('Disconnecting worker');
         cluster.workers[id].disconnect();
      });
   }, 10000);

   cluster.on('disconnect', function() {
      console.log('Cluster: worker is disconnected');
   });

} else {

   console.log('Worker started');

   cluster.worker.on('disconnect', function(){
      console.log('Worker disconnected');
   });

   net.createServer(function(req, res){
      console.log('Incoming request');
   }).listen(8080).on('close', function(){
      console.log('Server is closed');
   }).on('listening', function(){
      console.log('Worker listening');
   });


}