Interesting! Could we take a look at the SM details?
Try popping in this command for a sec: r.ForceLOD 0 this will force the LOD to be 0 for everything so do this in a small environment and see if there’s any changes.
Lastly, what is the asset name/collection? I’d like to check it out on my side.
The Nanite visualization is in the view mode tab:
