SMESH surfaceSmoothing high aspect ration cells issue/bug?

I found that when trying to smooth the 2D mesh of a 3D structured mesh for a mesh with high aspect ration, it begings to break the cells. here can be seen, before/after/after zoomed:

an example of this:
issueSmoothingAlgo.hdf (603,0 KB)
Is it possible to modify the smooth of two directions while keeping the third one (height of the thin cells) fixed?