[Gmsh] Gmsh 2.5.x generates bad structured meshes?

[VeTArg]

Hello everybody,

I think I found a bug in newer 2.5.x Gmsh versions when it comes to generating structured meshes. It apparently generates faces not connected (or badly conected) to the volumes they define. Creating a mesh in the same way using Gmsh 2.4 works well though.
I found this mistake when reading the mesh with the preprocessor of Code_Saturne, a CFD solver developed by Electricité de France. I'm giving you now the link to the discussion at Saturne's forum where the issue was discussed (it includes the .geo file):

https://code-saturne.info/products/code-saturne/forums/general-usage/953642757

The .geo file was generated by an octave script I made, which I can provide on request. I hope you find this info useful to keep improving this wonderful mesher.
Regards,

César Vecchio

PD: I say the error appears on structured meshes just because I found it with this kind of meshes. I don't know if it's present or not on unstructured meshes.