[Bug] FutureConnection method isConnected() return wrong status

[ansonliaomelco]

Hi
My mqtt-client version is 1.12

And I am facing the problem is FutureConnection#isConnectd() return the wrong status, the screenshot as below.

even the method
FutureConnection#isConnected()
return false, after statement
System.out.println("MQTT connected?" + connection.isConnected());,

run
FutureConnection#subscribe(...)
and
FutureConnection#publish(...)
are works fine and
FutureConnection#receive()#await()
also received message well.

Please help to fix it.