Rotating object with baked lights turns it dark

Hi there,

I have a building in my game which i need to spawn in some places on the map. So I baked the lights. I have one Mixed Light and three Baked Lights. I need to rotate the building at runtime. But rotating the building turns it dark. What is the reason and what do you recommend as the solution?

Thanks in advance.

Maybe you need to write a Script that if it rotates that the lights needs to be baked again.