How to reproduce:
1. Open the attached project "IN-132228”
2. Open the "Scenes/SampleScene.unity" scene
3. Build and run for iOS
4. Click "Allow" on the camera usage request pop-up
5. Observe the AR object on the device screen

Actual result: Object is darker (see attached “Repro and no repro comparison”)
Expected result: Object is lighter (see attached “Repro and no repro comparison”)

Reproducible with: 6000.3.0a1, 6000.3.7f1, 6000.4.0b7, 6000.5.0a6
Not reproducible with: 6000.0.66f2 (a74304d3a9e3), 6000.1.0b1 (747f458f33a3)
Could not test with: 6000.1.0b2, 6000.2.0b2 (2bdac9ac0d74) (Xcode errors)

Reproducible on environment: macOS 26.2 (M1 Max)
Not reproducible on environment: No other environments tested

Reproducible with these devices:
VLNQA00631 - iPhone 15 (MTP03QN/A), CPU: t8120, OS: 26.1
VLNQA00232 - iPhone 8 Plus (MQ8M2ET/A), CPU: Apple A11 Bionic, GPU: Apple designed, OS: 16.7.10
VLNQA00636 - iPad mini (A17 Pro) (MXN83KN/A), CPU: t8130, OS: 18.3.1

Not reproducible with these devices:
VLNQA00655 - Samsung Galaxy A15 5G (SM-A156E), CPU: MediaTek Dimensity 6100+ (MT6835), GPU: Mali-G57 MC2, OS: 15

Notes:
- Does not reproduce in the Editor
- Does not reproduce if the "AR Environment Probe Manager" component is disabled on the "XR Origin" GameObject
- FAV likely is in "Could not test with" versions