UE5 Lightmap Density artefacts and issues with baked lighting

[LukeTinyT]

For anyone else seeing this post, I replaced the LightMapDensityShader.usf file with this from the UE GitHub and it fixed the problem

https://github.com/EpicGames/UnrealEngine/blob/c18b86b59ecd13f3c6caedb550355b8406f5699e/Engine/Shaders/Private/LightMapDensityShader.usf