Diffuse shader + spot light + extruded tiles = light only affects intersections

[valba8]

Hi,

I was trying to illuminate a tiled map imported with Tiled2Unity, so I imported the map as usual and then I changed the shader to Tiled2Unity/Diffuse Depth (Instanced). An important point is that my tiles were extruded some pixels to avoid or minimize the seams problem. So finally I added a point light to the scene and then I got this result:

As you can see, it seems like only the extruded parts are illuminated, while the main part of each tile remains dark. I tried several other shaders (like DefaultDiffuse and others) and the effect is always the same. With a directional light the effect disappears (but if you have another spot/point light in the scene the effect keeps appearing in the near tiles).