This still seems broken for me. Here is an example of the normals flickering. I just uploaded this FBX.
The blend shape is only on the eyes and nose area. I purposely painted out the rest of the vertices to make sure there was no vertex movement outside the eyes and nose. You can see the ear area flickering. I don't know if it has to do with FBX export and floating point math. But when I bring it back into Maya and crank the blend shape to 10+ you don't see any vertex movement in that area. Any help with this would be greatly appreciated.