Cutout material to let baked emission through itself?

Hi All,

When using a standard cutout shader/material, it won't let emission through the "holes" so that anything behind the cutout surface remains unlit when baked. This has worked with 4.6 and I'm struggling to get it working again after upgrading to Unity 5.

Please see the examples below.

Using an emissive surface, the sphere receives no light/shadow, while its cutout "cage" is pretty hardly lit:

Same setup, with a spotlight instead of the emissive surface (light is being let through the grill as expected):

Does anybody know how to get this working? My real (complex) scene works with emission almost exclusively and I'd like to keep it that way.

Please download the scene from here: http://forum.unity3d.com/attachments/cutoutbake-zip.148393/

Update: If I change the render mode from cutout to fade or transparent, the issue remains. If I make an equivalent cutout shader forge shader, the issue remains.

Thank you.