How to reproduce:
1. Open the “ReproProject.zip“ project
2. Open the “main“ scene
3. Build for iOS
4. Open the “Unity-iPhone.xcodeproj“ in Xcode
5. Deploy to a device
6. In the app, press the “ref“ button (top-left corner)

Expected result: Screen turns solid blue color (no skybox)
Actual result: Skybox is displayed

Reproducible with: 2022.3.68f1, 6000.0.62f1, 6000.2.12f1, 6000.3.0b9, 6000.4.0a4, 6000.5.0a1

Reproducible environment: macOS 15.7 (M4 Max), macOS 15.6.1 (M4 Pro)
Not reproducible environment: No other environment tested

Reproducible with these devices:
VLNQA00319, Google - (Pixel 4), Android 13, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00232, iPhone 8 Plus (MQ8M2ET/A), CPU: Apple A11 Bionic, OS: 16.7.10
VLNQA00626, iPhone 16 (MYE73QN/A), CPU: Apple A18 Pro, OS: 18.5
VLNQA00648, iPhone Air (MG2P4QN/A), CPU: A19 Pro chip, OS: 26.0.1
VLNQA00535, iPhone XS (MT9F2ET/A), CPU: Apple A12 Bionic, OS: 17.6.1
VLNQA00416, iPhone 13 Pro (MLVA3ET/A), CPU: Apple A15 Bionic, OS: 17.6.1
VLNQA00491, iPhone 14 Pro (MQ083PX/A), CPU: Apple A16 Bionic, OS: 16.0

Note: Not reproducible in the Editor