Qt3DRender::QRenderSettings::OnDemand does not work on Qt 5.15 as in 5.12.7

User contacted Qt Support regarding an issue when they try to move from Qt 5.12.7 to 5.15.

They sent an example which works on 5.12.7(Torys visible) but not on 5.15(No visible Torus).

We checked the project and found if framegraph.cpp line 11
Renderpolicy OnDemand was updated to:
m_renderSettings->setRenderPolicy(Qt3DRender::QRenderSettings::Always);

the Torus will be visible.

Is it a bug that OnDemand RenderPolicy does not work on 5.15 similar to 5.12.7?

User would want to use it as it would save some resources.