Operating system: elementaryOS 0.4.1
Graphics card: GTX 1080
Broken: 2.80, 94f55d14c34b
Worked: 2.80, 69b2f52 (and later)
Short description of error
The Light Path node doesn't work as expected anymore in World. It does seem to work fine in material nodes though.
Exact steps for others to reproduce the error
Open the following file and enable viewport rendering. The diffuse materials should be affected by the blue environment color, but that's not the case. This worked fine a few days ago.