There is good reason to believe that something or someone exists beyond space-time. Whatever exists within space-time is contingent upon space-time for its existence; if space-time is gone, then everything within space-time will also be gone. So it cannot acquire any property or characteristic from space-time itself or from anything within space-time that will make space-time itself non-existent, because by that process it will cause its own demise. This is simple common sense. Our existence is contingent upon the existence of earth; so if we destroy the earth, we will also be destroyed.
Now light originates within space-time; that means the existence of light is contingent upon the existence of space-time. So in case of light also the above will be true; light cannot acquire any property or properties from space-time itself or from anything within space-time that will make space-time non-existent for it. But from SR we see that time totally stops for light and that even infinite distance becomes zero for it. That means space and time become non-existent for light. Therefore due to the reason given above we can say that light must have received these two properties from someone or something whose existence is not contingent upon the existence of space-time and whose existence will not be affected in any way even when space-time is gone.