Toggle Light Scene stops working

Have Scene to toggle light on at 8am and off at 10pm. All works fine til there’s a power failure, then stops working. I can toggle light on & off manually, but the schedule doesn’t work. When the light doesn’t come on at 8am, I toggle it on manually. But then it doesn’t toggle off at 10pm.

Each time I have to delete the Scene and recreate it. Very annoying.