No snow on multi-LODs scenery objects

this is known issue since the SU5 and seems being partially fixed in SU7, but
for now, snow appears on single LOD models only, same models with LODs do not
have a snow at all thanks

“on single LOD models only” Which is supposed to be a big no no…

You can check this topic, same issue:
<https://devsupport.flightsimulator.com/questions/2990/snow-problem-on-third-
party-scenery.html>