How to reproduce:
1. Open the attached "hdrpET" project
2. Open the "OutdoorsScene" scene
3. Open the Game view
4. In the Hierarchy, select the "GameObject (1)" GameObject
5. In the Inspector, drag "Scale" X or Y value to any negative value
6. Observe the results

Expected results: The smaller the value, the bigger the black fog appears, similar to when you change the scale on a 3D or 2D GameObject
Actual results: The black fog disappears at 0 and doesn't change if the scale is any negative number

Reproducible with: 6000.0.46f1, 6000.1.0b14, 6000.2.0a8

Reproducible on: macOS Sequoia 15.3 (M1)
Not reproducible on: No other environment tested

Note: The box itself is changing with the negative values, but fog is not rendered