Up close, I cannot see light leaking in the corners, but once I move far enough away, I begin to see light leaking from between meshes. They are aligned perfectly so there is no gap. This is with completely default lighting from the environmental light mixer, but I’m hiding the skylight to show the leaks more clearly. What could be causing this?
Generating mesh distance fields for the meshes seems to mostly fix the vertical light gap, but the horizontal light gap at the top is still only about half-fixed.
Try Deep shadow on your source light