A caustic-like effect appears. The light from the HDRI passes through the grille in the ceiling, passes through the plane of Light and is refracted strangely as it hits the floor. Render result of my setup in attachment. This effect does not disappear when I change other settings in Light tag
Is it bug or feature?
Simple scene in attachment. HDRI texture is Rural Asphalt Road from HDRI Haven, here is link