Anyway to prevent HLODs to rebuild?

Hi there,

I’m using Hierarchical LOD in world composition levels of an open world game. I used different ways for clustering and built the HLODs. it seems ok but with any minor edits of materials or even any unwanted changes the HLODs needs to rebuild. Actually I don’t want them to change so is there any way to fix them? Have you any experience on HLOD to share?

P.S: Even after opening up any meshes material instance, it’s corresponding cluster changes to not built.

Thank you in advanced