How to enable normalmap baking into lightmaps on mobile?

Hi! I've created a simple scene and set Android/iOS as target platform: 1. Camera 2. Directional light 3. Plane with a Mobile/Bumped Diffuse material with a normal map. The plane is textured and the normal map works fine. If I try to bake the lightmaps for this scene, the light is baked fine, but the "bumpiness" from the normal map disappears.

If I switch to PC platform, and re-bake the lightmap, the "bumpiness" of the normal map is baked into the lightmap and everything looks fine.

Is that a bug of the Android/iOS platform? Or is there some kind of quality setting which I need to toggle?