It looks like they are not building surface lightmaps at all, even the walls don’t have any of the light from the cone.
When this only happens in GPU lightmass it is usually because the geometry type isn’t supported by hardware raytracing (brushes, procedural meshes, spline meshes, etc.)
example:
Left: Static mesh
Right: Box brush
Since you say these are static meshes I’m not sure what the cause would be honestly…