Inverse square falloff lighting bug - when I toggle it off my light goes dark, and I can never get it back again.

So I have a scene setup in Unreal 5.1 - I have my lighting set correctly, but I just wanted to toggle the inverse-square falloff.
It broke my scene.

Now I can only toggle between totally dark, and some other version.

Neither of which was how my lighting was to start with.

Hello
Same problem here. Lights (in that case spot lights) broke after I did a test unchecking inverse squared falloff. To get some light I have to keep it unchecked and use strange values in the falloff exponent.
Has anyone some kind of explanation/solution?

I think I know what happened, I also had the same situation. I realized looking closer the lights were not totally dark, just almost off. The “intensity units” changed when toggling “Inversed Square FallOff” back on from “candelas” to “Unitless”.

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Thank you! It was driving me crazy, I couldn’t figure out what was happening. Still kind of seems like a bug they should fix though.