Day/Night Cycle Doesn't Darken World (Problem with Lerp)

I followed a tutorial in 4.27 on a day/night cycle (LINK) and I completed the blueprints, but LERP value for the intensity of the skylight and directional light ONLY uses the “A” section and NEVER the “B”.
This causes it to never turn dark at night.
How do I fix this?

WHAT I GET

WHAT I WANT
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