Hey Leertaste,
Make a Check-in Changes snapshot and put a description in the changelog like Invalid HLOD.
Check your World Settings tab
Whats your Runtime Spatial Hash ? WorldPartitionRuntimeSpatialHash or WorldPartitionRuntimeHashSet
Does the Default HLOD Layer point to your current HLOD layer ?
Hang on, your HLOD layer is Asteria_Trees_HLOD… sounds like you are using multiple HLOD layers or is it just the one ?
If it has been working before, and your running a live edit session when you build HLODs, it may just require closing the launched session and restarting editor, build HLODs again before you launch.
Otherwise if you haven’t successfully built HLODs, how have you set them up ?
Have you added the HLOD layer inside the props settings ?