How to reproduce:
1. Open the attached project "HDRP-Outdoor-Sample.zip"
2. Select Landscape>Plain01>Group57079 in the Hierarchy window
3. Edit the "Amplitude" in the Inspector window
Expected results: Changes are visible in the Scene view
Actual results: There are no changes to the Height map in the Scene view
Reproducible with: 2022.3.10f1, 2023.1.14f1, 2023.2.0b11, 2023.3.0a6
Could not test with: 2021.3.30f1 (compilation errors in the Console window)
Reproducible on: Windows 11 22H2
Not reproducible on: No other environment tested