Unity 5 Bumped terrain ignores normal maps on WP8 build target

While build target is anything other than Windows Phone 8, terrains with builtin shaders (standard, legacy specular, legacy diffuse) enable normal maps (I only tested in editor)

When switched build target to Windows Phone 8, terrains normal maps gets ignored and it just acts like textures doesn't have normal maps.

Same thing goes with Specularity.

Is this a unity 5 bug? Or something windows phone devices can't support(however as I know it used to work on unity4)? Or am I missing a setting? Did anyone else also encounter this issue?

Thanks.