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Z-value problem when using alpha with SPS


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I have some problems with the z-Values of the faces of a cube when using the "hasVertexAlpha" on the mesh of the SPS. The bottom shows even if alpha is set to 1.0. and the other faces dont seem to be correct too.
I created a material for the sps mesh and set backface culling to false. 

I recreated it in the playground : http://www.babylonjs-playground.com/#1WP9KY#1.

Is this a bug? or am I just doing something wrong?

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this is the real explanation !

the sps mesh transparency will be ever right compared to any other mesh in the scene, but the transparency between its own faces (so its particles) isn't sorted along z

Please have a read here, everything is detailed : http://doc.babylonjs.com/tutorials/Transparency_and_How_Meshes_Are_Rendered

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