Break dynamic creation of Scene3D during heavy-mesh loading causes segfault

1  ??                                                                                                                                            
2  QMetaObject::cast                                                                                       qmetaobject.cpp    374 0x7ffff5a333ec 
3  QMetaObject::cast                                                                                       qmetaobject.cpp    363 0x7ffff5a333bf 
4  qobject_cast<QObject *>                                                                                 qobject.h          508 0x7fffda7b60a8 
5  QtPrivate::QVariantValueHelper<QObject *>::object                                                       qvariant.h         737 0x7fffda7b5f6a 
6  QtPrivate::ObjectInvoker<QtPrivate::QVariantValueHelper<QObject *>, QVariant const&, QObject *>::invoke qvariant.h         108 0x7fffda7b5ed0 
7  qvariant_cast<QObject *>                                                                                qvariant.h         865 0x7fffda7b5d9a 
8  QVariant::value<QObject *>                                                                              qvariant.h         364 0x7fffda7b5cc4 
9  Qt3DInput::Input::InputSettings::sceneChangeEvent                                                       inputsettings.cpp  72  0x7fffda7b56fa 
10 Qt3DCore::QBackendNodePrivate::sceneChangeEvent                                                         qbackendnode.cpp   85  0x7fffda2b74f2 
11 Qt3DCore::QChangeArbiter::distributeQueueChanges                                                        qchangearbiter.cpp 134 0x7fffda282e86 
12 Qt3DCore::QChangeArbiter::syncChanges                                                                   qchangearbiter.cpp 183 0x7fffda283272 
13 Qt3DCore::QAspectManager::exec                                                                          qaspectmanager.cpp 306 0x7fffda29e3f3 
14 Qt3DCore::QAspectThread::run                                                                            qaspectthread.cpp  86  0x7fffda29f5e7 
15 QThreadPrivate::start                                                                                   qthread_unix.cpp   360 0x7ffff57bde02 
16 start_thread                                                                                            pthread_create.c   463 0x7ffff48e76db 
17 clone                                                                                                   clone.S            95  0x7ffff4e2488f