4.4 Lighting broken on mobile?

Not sure the best place to ask this, but this seems like it will work.

In the two attached screens you can see the difference between my PC and mobile preview builds. It appears that only the emissives are lit in the mobile build. Previous to 4.4, my PC and mobile builds looked very similar.

To my knowledge, I’ve changed nothing that should have done this. Anyone know how to fix this or at least where to start looking?