[Bug]Can't send D-Bus struct as variant with PyQt6

[JakobDev]

On PyQt5 it is possible to pass a struct marked as variant as argument to a D-Bus method. However, on PyQt6 this is no longer possible. It throws this error:

QDBusMarshaller: type 'PyQt_PyObject' (65734) is not registered with D-BUS. Use qDBusRegisterMetaType to register it
qt.dbus.integration: QDBusConnection: error: could not send message to service "com.example.App" path "/com/example/App" interface "com.example.App" member "Example": Marshalling failed: Unregistered type PyQt_PyObject passed in arguments

I attached a example code which shows the behaviour in PyQt5 and PyQt6. The error happens before anything is send, so you don't need a specific D-Bus interface to test it.
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