Steps to reproduce:
1. Open the attached “Bugs2023” project
2. Open “SampleScene”
3. Select “Assets/Skybox_Cubemap (Blurred)” and in the Inspector window change the Rotation variable
4. Observe the Scene view

Expected result: The skybox is rendered or throws an error in the Console
Actual result: The skybox is displayed as a solid color without any errors

Reproducible with: 2021.3.37f1, 2022.3.25f1, 2023.2.19f1, 6000.0.0b16

Testing environment: macOS Sonoma 14.4.1 (Intel), macOS 14.4.1 (M2), Windows 10
Not reproducible on: No other environment tested

Notes:
- Reproducible in both the Editor and the Player
- In the Player, the skybox is rendered as black color
- Doesn’t reproduce when changing Default Render Pipeline in Project Settings → Graphics to None