Pink areas mean places which don’t receive surface cache and can’t do multiple bounces and are black in reflections if you don’t use hit lighting. So usually some pink is fine and doesn’t have big influence on the final pixels.
That h-profile likely exceeded max number of allowed cards. Bumping MaxLumenMeshCards in the static mesh should fix it.
Also as Arkiras noticed we try to ignore small detail below 20 units. Goal here is to generate an efficient, but approximate surface coverage. Nanite enables creation of truly complex meshes, so we can’t aim for 100% surface representation.
Otherwise we are gathering all failing use cases and will work following week on improving the generation algorithm.