Bug: `env_sun` does not render with `%compileSkyOcclusion`

[HugoBDesigner]

Describe the bug

When using a skybox texture with %compileSkyOcclusion 1, the sprite for env_sun does not render. It still renders correctly on a regular skybox material.

To Reproduce

On the left is a box using an occlusion skybox. On the right is the default toolsskybox:

In-game:

Issue Map

skybox_test.zip

Expected Behavior

It should show up on any skybox material

Operating System

No response