Why did adding these meshes to Prefab cause them to no longer be effected by lighting?

i’m not sure if this is an issues with the new update i downloaded today but i’ve never had this happen to me before. im working on making a hallway prefab section. everything is going great and rendering great until i add the objects to a prefab. the second i add it to a prefab 3/4 of the meshes turn black and no longer accept lighting. i have pictures below.
nothing is changed between these two pictures other than adding object to Prefab. Why is this happening?



Can you check the layers and make sure they are not being culled? If they are prefabs you may have changed their layer at some point