Custom skybox is a missing texture after packing

[Stack Man]

I've recompiled this 9 year old map: https://gamebanana.com/maps/162968

For some reason, after packing, the skybox shows up as a missing texture (but none of the other custom textures do).

VIDE shows that all 6 skybox textures were successfully packed and it works when the textures are in my personal directory.

Here's what the inside of one of the skybox's vmts looks like:

"UnlitGeneric"
{ "$basetexture" "skybox\Minecraftlf"
"$nofog" 1
"$ignorez" 1
}
​

Any help?

Edit: As it turns out, for some inexplicable reason, the skyboxes' vmts were packed, but not the vtfs, so I had to add them manually.