Issue was that an incorrect/erroneous Ground Object Id (6384) was being used. It seems it was intended to provide a light for a "HALLOWED_TORCH" object, but I checked around Darkmeyer and the Hallowed Sepulchre, and no objects appear to be using that Id (and the Red Street Lamps already have their own entry, so it's not those).
Issue was that an incorrect/erroneous Ground Object Id (6384) was being used. It seems it was intended to provide a light for a "HALLOWED_TORCH" object, but I checked around Darkmeyer and the Hallowed Sepulchre, and no objects appear to be using that Id (and the Red Street Lamps already have their own entry, so it's not those).