Hmmm, I’m still on 4.26 so I can’t check directly, but see if maybe there is a function in the FoliageHISM actor to rebuild the Foilage HISM cluster data after removing the first batch. Like:
BuildTreeIfOutdated(true, true)
I thought this was called indirectly when removing instances but I’m not positive on that, and things may have changed for 5.0