I've come across a Cycles issue where the disks of disk-shaped area lights are invisible in a rendered scene, but they are visible in a window with reflective glass material.
To put it another way, the light issuing from the disk-shaped area lights works fine, and the disks themselves are invisible when rendered--as they should be--with the exception that they are visible when reflected in a glass window. Why? Is there a way to fix this? Thanks. Blender 3.3.1, Windows 11