Problems whith defaut UberEnvironment Rendering - SOLVED!!!
Finally solved the problem...
I only have to turn the normals inside out on all the surfaces in the right model and everything is ok.
Conclusion: Left figure have the normals pointing outward. Right figure, have the normals reversed, pointing inwards.
Weird and simple but a fact, I won't mention all the weird things I've tried until I figured that out... :ahhh:
I've tried to figure out what could be wrong with my figure that makes default UberEnvironment Render it like this: