How to reproduce:
1. Open the attached "IN-151595_3477517-contactshadow.zip" project
2. Open the “ContactShadowRepro” scene
3. Enter Play mode
4. Wait for the Play mode to exit automatically
5. In the console, find a log message containing a path to a "[...]/Unity Technologies/com_unity_template_hdrp-blank/captures" folder on your device
6. Go to the folder path from the log
7. In the folder, find and open a file named "A_fullres_noaa.png"
8. Observe the shadows in the image
Actual result: Staircasing artifacts are visible along shadow boundaries
Expected result: Shadow boundaries do not produce artifacts
Reproducible with: 6000.5.10f1, 6000.6.0a1 (b0e692525f04), 6000.6.0b10, 6000.7.0a5
Not reproducible with: 6000.0.82f1, 6000.3.23f1, 6000.5.0a7
Reproducible on: Windows 11, macOS 26.6 (By user)
Not reproducible on: No other environments tested