Windows 7 Pro 64 bit. Nvidia geforce 540LE


Current build 59393 broken
Last build that works. 58839

--- Short description of error ---
Not really an error, more of behavioral inconsistency that has popped up.

This only happens on objects which have a modifier. I've tried using two methods.

bmesh.from_object() and
object.to_mesh() + bmesh.from_mesh()

In the Contour Tools addon, I raycast a blender object to get a starting face to then use in a bmesh operator. In the past (before 58839) the index returned by ray_cast would always return an index which was reliably the index of the corresponding face in the bmesh. (with exception, ray_cast intersecting an Ngon)

The fidelity seemed to be preserved in both object -> bmesh and bmesh -> object directions before this error started popping up

This is partially related to issue #36363 but I believe it is a separate issue as I'm encountering it with meshes without ngons
https://projects.blender.org/tracker/?func=detail&atid=498&aid=36363&group_id=9

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---
open the blend
run the script

Notice that the bmesh face as specified by the index returned from ob.ray_cast does not match!