Ray Tracing Got Me a Black Ceiling???

Hi everyone.

I wanted to move from Lumen to Ray Tracing and do a project with that, but I ran into an issue that when ray tracing is active, any object’s side that’s facing down is black as if no bounce is hitting that.
you can see in the video when I switch between Lumen and Ray Tracing in PPV that the ceiling turns black.

Thank you in advance

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