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Blender 2.80 released candidate - volumetric light bug rendering.
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Description

System Information
Operating system: Windows 8.1
Graphics card: NVIDIA 740 M

Blender Version
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Worked: (optional)
Blender 2.80 released candidate

Short description of error
The interior edge of the cube has a strange lighting edge of the cube only the face where the light intersects it.
See my test blender file:


See my screenshot:

I tested with all lights
A good approach to reality is on Spot Shape - Size is < 41.6

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
create a scene with volumetric light

Details

Type
Bug

Event Timeline

This is not related to Volumetric Lighting, and seems to be a limitation of the current eevee shadowing methods, see T66708 for a bit more information...
Or have a look at the manual about light leaking...