well, you definately have to reload the map to load the new cubemaps. The first time you reload it after building, you notice a pause just as you spawn (length depending on how many cubemaps youve built), which are the new cubemaps loading/saving to the bsp. In my console it tells me it wont load new cubemaps unless sv_cheats is on. Not sure if this was the same before the update, only just started using them myself.
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