m_parentNode is only set in QQuick3DParticleAbstractShape::componentComplete(), so shape will not function correctly when dynamically created without parent and reparented later. QDS does this when a new node is added to the scene, so a puppet reset is required to make it work.

Also, since reparenting doesn't update the m_parentNode, you can get a crash if the original parent node is deleted after reparenting.