IIrc there was a patch note in the latest update that mentioned something about HLODs not loaded into the server or something, I can’t find it now but I read it when the new UEFN patch released. There was also two different things in the build of HLODs:
-Validation fix up tool did something in the HLOD generated meshes when it run
-Some HLODs were locked by another team account accidentally, and URC had some of them locked after they completed building.