ActiveQt: constructor/deconstructor are called two times, but these two are not really usable objects, only one.

[Edit, see comments; this bug seems to be within testcon.exe]

When I create a absolutely small example of an in-process ActiveX application, the provided Controls are instantiated two times by Qt. The example is attached.

The constructor is called two times, the deconstructor as-well, but without the implemented debugging message.

[TERMINAL]
ChristianRi@ChristianRi-nb ~
$ testcon.exe
<RiesAxAddress> Constructor
<RiesAxAddress> Constructor
External WM_DESTROY received for QWidgetWindow(0x1067b58, name = "RiesAxAddressWindow") , parent: QObject(0x0) , transient parent: QObject(0x0)
<RiesAxAddress> Deconstructor
External WM_DESTROY received for QWidgetWindow(0x5b55f88, name = "RiesAxAddressWindow") , parent: QObject(0x0) , transient parent: QObject(0x0)
[/TERMINAL]