(W7 64) LR 4.3 print module is not wysiwyg

(W7 64) LR 4.3 print module is not wysiwyg .

My system is color managed (Monitor and Printer).

To show the problem :

Create a plain grey image with ICC profile(prophoto in my case).

Go to Print Module

Adjust "Page Background Color" to be identical grey (with the color picker tool)

Now all you have is a new uniform grey image (you can't tell what's image and what's background)

"Print to File" with ICC profile.

Original image (prophoto ICC Profile)

(Corner of) Image with Stroke Border (up) and without Stroke Border (bottom) to check that all colors are the same.

Result jpeg : Not wysiwyg ! Should be all grey.

Print Module doesn't color manage its colors ?