1157

Very old "Issue" maybe some info here. https://github.com/ValveSoftware/Source-1-Games/issues/220

I have been having this issue since 2013 with a valve sourcemod (hldms).I you look further down the link you will see the exact issue you describe " Combine Soldier...

This does work I have used many time's on my level's. The problem is a default black vtf valve has added to calm down some reflections before cubemaps are built,...

It is the only place you would post a bug with SDK, here is the fix. https://www.youtube.com/watch?v=Kcd-3H04_kw