Qt3D line rendering differs between Qt3DQuickWindow and Scene3D

Rendering lines from Qt3DQuickWindow and Scene3D does not give the same result.

Applying tips given here https://doc.qt.io/qt-5/qml-qtquick-scene3d-scene3d.html#details or here https://doc.qt.io/qt-5.12/qt3drender-protips.html#blending-with-scene3d does not help.

Trying to change defaultFormat don't help either. 

I just tried Qt 6.1, and it's getting worse. The original issue is still here, and now line adjacency seems have an issue too. I link the converted projects.