Operating system: window 10
Graphics card: 9700k, 2080s( the newest studio driver), 32GB
Broken: blender-2.83-79b391f3a009-windows64(also test in the 2.82a stable)
Short description of error
when using light fall off node to control the spot light in cycles (the node like below)
the ipr render in viewport is not the same of the final render by clicking f12(the first is the viewport render, the second is the finalrender )
I try it with the cpu/gpu cuda/optix render (support and ex feathers ),but get the same result:
they all show good in viewport rendering ,but not right in the final rendering !
the scene is not too big(use the alt d mesh,the mesh is about 2MB total)
work the same in a very simple scene(link below)
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
simple blend file: