Blender Version
Broken: 2.82 2.83
Worked: unknown

Short description of error

"Principle volume" shader have different result in 3D view-port (render preview) and rendered image (Cycles).

The parameter that create the problems is "temperature" and "Blackbody intensity", changing those parameters affect the shader in the viewport but have no effect in the rendered image.

see images below:

<img src="http://www.lluc3d.com/BlenderFiles/principleVolume-1.jpg">

<img src="http://www.lluc3d.com/BlenderFiles/principleVolume-2.jpg">

Exact steps for others to reproduce the error
Using the "Principle volume" shader apply it to and object and changing the "temperature" and "Blackbody intensity" parameters, then look at the render result and render preview in the view-port using Cycles.