Reproduction steps:
1. Open the attached “IN-85429” project
2. Open the “Rain“ scene, located in the “Assets/Samples/High Definition RP/17.0.3/Water Samples/Scenes“ folder
3. In the Hierarchy window, select the “Volume” GameObject
4. In the Inspector window, inside the “Volume” component, enable the “Background Clouds” option under the “Visual Environment” tab
5. Observe the Game view

Expected result: Nothing changes when the “Background Clouds” override is toggled on
Actual result: A horizontal line appears when the override is enabled

Reproducible in: 6000.0.23f1
Couldn’t test in: 2021.3.43f1, 2022.3.50f1 (Unable to fix errors)

Reproducible on: Windows 11
Not reproducible on: No other environment tested

Note: Reproducible in Player