Reproduction steps:
1. Open the attached "IN-124344_REPRO" project
2. Open the “Assets/Scenes/SampleScene.unity”
3. Observe the Scene view

Actual result: HDRI reflections are not seen on the Sphere and Cube
Expected result: HDRI reflections are seen on the Sphere and Cube

Reproducible with: 6000.0.61f1, 6000.0.63f1
Not reproducible with: 6000.0.60f1 (61dfb374e36f), 6000.2.15f1, 6000.3.0f1 (d1870ce95baf), 6000.4.0a5, 6000.5.0a2

Reproduced on: macOS 26.0.1 (M1 Max) (customer), Windows 11
Not reproducible on: No other environments tested

Notes:
- The customer reported that the issue is also present in Game View and builds, but during testing, this issue did not reproduce (Windows 11)
- Reproducibility also depends on the camera’s field of view (FOV) and the size of the Scene View window (and monitor resolution because of it). If the issue doesn’t reproduce on project open, zooming in usually triggers it