HLOD clusters need to be rebuilt

Is anyone else having this when using HLODs?:

  • (manually) created 90 HLOD clusters
  • Generated the HLOD meshes in the HLOD menu
  • The meshes and materials are correctly created and stored in a /maps/HLOD folder
  • Everything seems to be working fine, until you re-open the level
  • When playing the level there is a message saying “HLOD clusters need to be rebuilt”
  • When opening the HLOD menu, most (but not all, see screenshot) HLOD are in status “(Not built)”
  • The HLODs are still present in the folder, and still work in the level, until I press “Save all” in the HLOD ouliner, then only the built HLODs remain (which makes sense).

284926-2019-08-13-18-06-11-hierarchical-lod-outliner.jpg

Some info on my level:

  • I’m having >2500 actors, mostly static
  • No sub-levels
  • 90 HLODs, containing some 1500 actors

It’s difficult to re-produce on a smaller scale, so I’m not really sure how to write a bug report for this… There have been a few questions in the past indicating similar problems, but no resolution has been offered as far as I can see:
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