crash in Qt3DRender::Render::TrianglesExtractor::extract(Qt3DCore::QNodeId)

I'm getting the following crash in a render thread for a dynamic triangle strip GeometryRenderer mesh (T3TriangleStrip – see attached example to reproduce):

• thread #15: tid = 0x49e6b5, 0x00000001000ff113 Qt3DRender`QVector<Qt3DCore::QBoundingVolume*> Qt3DRender::Render::(anonymous namespace)::processBuffer<QVector<Qt3DCore::QBoundingVolume*>, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> > >(Qt3DRender::Render::(anonymous namespace)::BufferInfo const&, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> >&) + 29203, name = 'Thread (pooled)', stop reason = EXC_BAD_ACCESS (code=1, address=0x31c120c08)
  frame #0: 0x00000001000ff113 Qt3DRender`QVector<Qt3DCore::QBoundingVolume*> Qt3DRender::Render::(anonymous namespace)::processBuffer<QVector<Qt3DCore::QBoundingVolume*>, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> > >(Qt3DRender::Render::(anonymous namespace)::BufferInfo const&, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> >&) + 29203
  Qt3DRender`QVector<Qt3DCore::QBoundingVolume*> Qt3DRender::Render::(anonymous namespace)::processBuffer<QVector<Qt3DCore::QBoundingVolume*>, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> > >:
  -> 0x1000ff113 <+29203>: movl (%r13,%rax,4), %eax
  0x1000ff118 <+29208>: movl %eax, -0x48(%rbp)
  0x1000ff11b <+29211>: movl $0x1, %eax
  0x1000ff120 <+29216>: testl %r15d, %r15d
  (lldb) bt
• thread #15: tid = 0x49e6b5, 0x00000001000ff113 Qt3DRender`QVector<Qt3DCore::QBoundingVolume*> Qt3DRender::Render::(anonymous namespace)::processBuffer<QVector<Qt3DCore::QBoundingVolume*>, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> > >(Qt3DRender::Render::(anonymous namespace)::BufferInfo const&, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> >&) + 29203, name = 'Thread (pooled)', stop reason = EXC_BAD_ACCESS (code=1, address=0x31c120c08)
• frame #0: 0x00000001000ff113 Qt3DRender`QVector<Qt3DCore::QBoundingVolume*> Qt3DRender::Render::(anonymous namespace)::processBuffer<QVector<Qt3DCore::QBoundingVolume*>, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> > >(Qt3DRender::Render::(anonymous namespace)::BufferInfo const&, Qt3DRender::Render::(anonymous namespace)::IndexedVertexExecutor<unsigned int const, QVector<Qt3DCore::QBoundingVolume*> >&) + 29203
  frame #1: 0x00000001000c432d Qt3DRender`Qt3DRender::Render::TrianglesExtractor::extract(Qt3DCore::QNodeId) + 2557
  frame #2: 0x000000010018e502 Qt3DRender`Qt3DRender::Render::CalcGeometryTriangleVolumes::run() + 82
  frame #3: 0x00000001003b4d98 Qt3DCore`Qt3DCore::AspectTaskRunnable::run() + 24
  frame #4: 0x0000000100a5e268 QtCore`QThreadPoolThread::run() + 104
  frame #5: 0x0000000100a6182a QtCore`QThreadPrivate::start(void*) + 362
  frame #6: 0x00007fff93ca39b1 libsystem_pthread.dylib`_pthread_body + 131
  frame #7: 0x00007fff93ca392e libsystem_pthread.dylib`_pthread_start + 168
  frame #8: 0x00007fff93ca1385 libsystem_pthread.dylib`thread_start + 13

• I also included a T3Frame which is a static geometry like cuboid etc. Has all the same basic code elements as the dynamic one. Not sure why one crashes and the other doesn't!

• ps. the Frame is a very useful geometry element – consider including something like this in base code!