MqttClient Invalid Property assignment: unsupported type "ushort"

First time report issue, be gentle and correct me, if i report wrong.

The example https://github.com/qt/qtmqtt/blob/5.13.0/examples/mqtt/quicksubscription/main.qml raises 2 erros in qml debugger errors:

1. qrc:/main.qml: 14 Invalid property assignment: unsupported type "ushort" 

I think is same as described for other module here: https://bugreports.qt.io/browse/QTBUG-46790

Make  Q_PROPERTY(quint16 port READ port WRITE setPort NOTIFY portChanged) to int with range check in getter/setter.

2. qrc:/main.qml:125 TypeError_ Propety 'destory' of object 0 is not a function

This I don't understand, maybe more experienced person know how to fix.