System Information
Operating system: windows 10 64 bit
Graphics card: RTX 2060 super

Blender Version
Broken: Blender 2.82a official / but it happen since a while now with older blender version
Worked: None

Short description of error

Blender doesn't save animation keyframe input (color/Value ...) in shader node with luxcore render engine.
From the blendluxcore Devs it is a blender issue.

Exact steps for others to reproduce the error

1/ install luxcore render engine from here : https://luxcorerender.org/download/

2/ in blender switch to Luxcore engine

3/ add a shader matte (or any shader)

4/ animate any shader value of your choice.