I figured it out. The HLODs weren’t building properly. Or the Lighting wasn’t building for the HLODs one of those two things. Which is now a separate issue I’m trying to resolve.
EDIT: Screenshot. This needed assigned. Then rebuild the HLODs a few times. HLODs seem to be a really buggy feature in UE5 so it took me 3 rebuilds for the texture to apply to the full 2k map.