The bug VSZ mentioned was posted originally by me, and this is what I uploaded the repro project for. It’s not about the LOD flickering (although it also is apparent in the repro project) but about the flickering of the whole HISMC, so even the instances which did not get modified. The whole HISMC seems to be invisible for one frame. Maybe you should re-read VSZ’s post 
He said “this can be reproduced by dynamically adding instances to a HISM component (eg: in a Tick event) and packaging the project for testing”, but he never said anything about “adding instances every frame”. The tick event was just an example. And it also happens on scaling, not only on adding/removing instances.