Loader3D crashes when active property is dynamically changed

                                                                                       
                                                                                       
1  QQuickWindowPrivate::polishItems      qquickwindow.cpp          358  0x7fffe98a26f7 
2  QSGThreadedRenderLoop::polishAndSync  qsgthreadedrenderloop.cpp 1556 0x7fffe9a6761e 
3  QQuickWindow::event                   qquickwindow.cpp          1523 0x7fffe98a4b12 
4  QCoreApplication::notifyInternal2     qthread_p.h               337  0x7ffff6b7894a 
5  QPlatformWindow::deliverUpdateRequest qplatformwindow.cpp       774  0x7ffff7817d45 
6  QPlatformWindow::windowEvent          qplatformwindow.cpp       454  0x7ffff7817d45 
7  QGuiApplication::notify               qguiapplication.cpp       1921 0x7ffff77dd2e3 
8  QCoreApplication::notifyInternal2     qthread_p.h               337  0x7ffff6b7894a 
9  QTimerInfoList::activateTimers        qtimerinfo_unix.cpp       610  0x7ffff6d07edb 
10 timerSourceDispatch                   qeventdispatcher_glib.cpp 149  0x7ffff6e1ed04 
11 g_main_context_dispatch                                              0x7ffff63bb17d 
12 ??                                                                   0x7ffff63bb400 
13 g_main_context_iteration                                             0x7ffff63bb4a3 
14 QEventDispatcherGlib::processEvents   qeventdispatcher_glib.cpp 393  0x7ffff6e1f04a 
15 QEventLoop::exec                      qflags.h                  108  0x7ffff6b8440b 
16 QCoreApplication::exec                qflags.h                  74   0x7ffff6b807ee 
17 main                                  main.cpp                  66   0x55555555561b