Qt3D - Wrong blending with QtQuick.Window

In a QtQuick.Window, when trying to use transparent Entity in a Scene3D with a transparent ClearBuffer the resulting blending color/alpha is wrong.

The material I'm using is PhongAlphaMaterial. I know it's deprecated but it's the one that let me set BlendEquationArguments

Also tried to change to DiffuseSpecularMaterial but also getting wrong results.

• This is what I get when I run the attached code:

As you can see the red-transparent sphere its not completely visualized.

• Result without setting BlendEquationParams to Sphere marerial (color should be red):

Here is another post I did with more info