Bug: Cubemaps break on Displacements

[NanoBiteTSF]

Describe the bug

When you turn a brush face into a displacement, cubemaps (normal or parallax corrected) completely stop rendering on that surface. Video demonstrating the bug with parallax corrected cubemaps (If the video fails to load due to the link expiring, paste and send the video URL in a discord chat/channel message)

To Reproduce

1. Create a map with env_cubemaps (and optionally parallax_obbs assigned to those cubemaps)
2. Create a brush with materials that utilize cubemaps
3. Turn a face on that brush into a displacement
4. Compile the map and build cubemaps

Issue Map

Any map with displacement surfaces that have materials utilizing cubemaps.

Expected Behavior

Cubemaps should still render on surfaces regardless of if they are displacements or not.

Operating System

No response