**System Information**
Operating system: Windows 10 64 bit
Graphics card: Intel HD Graphics
**Blender Version**
Broken: 2.90.1
Worked: IDK, but I've been using blender since 2.79 and have not encountered this problem when I have done this kind of thing.
**Short description of error**
When I have a mesh object that has both solid and Volume Scatter materials on it (in different slots), in EEVEE, the volumetric material only works if it is not in the second slot. If it is in the second slot (top down), it causes the black "shader missing" to be applied. Moving the volume slot up to the top with the solid material in the slot at the bottom causes normal operation.
**Exact steps for others to reproduce the error**
Go into edit mode on the default cube.
Duplicate the mesh, but leave it at 0 0 0. Scale the duplicate up a little.
Create a second material slot, and assign the duplicate larger cube to it. Leave edit mode.
Create a "Volume Scatter" material for the second slot. The outer cube will turn black.
Move the slit upwards without changing which materials are where. The outer cube will change to the proper fuzzy grey.
{F9502790}