Cubemaps dont write

When I try to build cubemaps on my maps, they dont write to the .bsp. I check with pakrat after to be sure and sure enough, no cubemap textures are created. I’ve tried numerous fixes, starting with the fresh compiled version of the map every time:

-deleting default cubemap textures (not materials) with pakrat
-renaming the map
-both of the above
-restarting gmod after loading the map the first time
-setting maps in garrysmod/garrysmod to not be read-only

Here’s the sequence I do in-game to build cubemaps:
mat_specular 0
buildcubemaps
mat_hdr_level 0
buildcubemaps
mat_hdr_level 2
mat_specular 1
mat_reloadallmaterials

Anyone have a fix? Also extra notes. When I load the map file initially and any time after, I dont get the overexposed specular surfaces you normally get when cubemaps are normally missing.

What skybox are you using?

Some EP2 sky. I dont remember what one exactly. I’ve used it before just fine.

I’ve been getting the same problem actually. Somebody told me to use a modified VBSP which I did and still got no luck D: