1/ Make an empty project in Unreal 5.8
2/ Make an empty level and make it the starting level in editor and game
3/ Add a single cube but scaled it to be a floor plane
4/ Added a single point light and made it stationary
5/ Added a single light mass importance volume
6/ Set all the relevant switches so UE would bake the lighting.
7/ Saved everything.
However when I went to build lighting all proceeded as normal except lighting progress stuck at 0 and ultimately produced the Lighting Build Failed error message with no reason given. In activity monitor I can see LightMass appear and disappear so it seems to be talking to that however.
Is there any solution to this that is Mac based? Thanks in advance.