qml_register_types_<Plugin> not called

Using the demo:

https://git.qt.io/public-demos/outrun/-/tree/main/Outrun_Cluster?ref_type=heads

it is not possible to import a statically compiled plugin. It is necessary to do:

 
Q_IMPORT_QML_PLUGIN(QOutrunMqttPlugin)
 
void
qml_register_types_QtOutrun_Mqtt();
 
int main(int argc, char *argv[])
{
qml_register_types_QtOutrun_Mqtt();
...