Has anyone seen anything like this? Everything looks fine in viewport renders. After a 5 hour bake I got this pane of glass emitting anti light. Interestingly, I tweaked some things after i saw this, did a test bake at low samples, and it looked clean. Then did a bake at 2000 samples again and the same glitch showed up.
Are you meant to have a Background node plugged into your material output?
I thought you had solved the puzzle for a moment thinking that I had somehow plugged a background shader into the output of the glass material, but that is the material for the object around the glass. This is for an online gltf application that uses only unlit materials, so in the end all my materials are image textures plugged into background nodes. I think that the glass material was somehow corrupted. I got rid of it and re-made it. It seems like things are working normally again.