SubD polygon to nurbs convertion issues

 From:  marc (MARCSAVARY)
9274.1 
Hi all, I'm currently working on a project that involves a lot of polygon to nurbs conversions, we are using Fusion 360 as a converter, between Cinema 4D and MOI. It's a rather annoying process, so I'm happy MOI is implementing that functionality directly :)
But I have some issues, F360 and MOI don't give the same results, and I don't know if it is a bug, or if it is normal differences.
Here is a test I made two simple rectangles, one that is simply 1 quadrangle, the other is subdivided:
https://postimg.cc/SXCyq4Sh
Converting those in Fusion 360 I get the same exact result, a clean rectangle, with all corners staying corners :
https://postimg.cc/Q9DjdzCW
Converting them in MOI, the 1st one is ok, the subdivided one is different, the surface is subdivided and the corners are rounded:
https://postimg.cc/r09M09RZ
Can someone comment on this?