Access modifiers are not handled correctly

There is a problem with the click processing method access modifier. There is a structure in the controller class that hides its private field.

class Controller : public QObject
 {
 Q_OBJECT
 public:
 explicit Controller(QObject *parent = nullptr);

struct Test

{ private: int m_data; };

Q_INVOKABLE void processClick();
 };

In the moc_ file, this field is marked as private, respectively, when called from the QML we get the following error:

qrc:/main.qml:22: TypeError: Property 'processClick' of object Controller(0x26cd170) is not a function

such behavior is observed both for the build of MINGW and for MSVC2019

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When placing the structure below the method declaration, or removing the word "private" from it, the defect is not reproduced