Copy pasting Spotlights removes the light cone
When you copy paste a grid with a spotlight or just the spotlight, the light still works, but the cone effect is gone. Doesn't matter if the spotlight is on or off during pasting, turning it on and off also doesn't fix it. Only grinding and rewelding or placing a new one does. Same thing happens when pasting a blueprint from the blueprint list.
Left grid on the screenshot is the pasted one, light is still on and lighting up stuff, just no cone.