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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Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://epicsupport.force.com/unrealengine/s/

Thanks