"HDRP/TerrainLit" shader and dependent Terrain ShaderGraphs report missing "BaseMapShader"/"BaseMapGenShader" dependencies and "All subshaders removed" warnings on a fresh HDRP template project

How to reproduce:
1. Create a new Unity project using the High Definition 3D template
2. Wait for the initial asset import to complete
3. Open the Console and observe the import-time warnings

Expected results: No shader dependency warnings are thrown and HDRP/TerrainLit (and the Terrain Shader Graphs that depend on it) are supported on this platform
Actual results: The warnings are thrown for HDRP/TerrainLit (3 times during import)

Reproducible with: 6000.0.76f1, 6000.3.15f1, 6000.4.8f1, 6000.5.0b9, 6000.6.0a6 (16.1.2 template version)

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested

First lines of warnings:
- Shader 'HDRP/TerrainLit': dependency 'BaseMapShader' shader 'Hidden/HDRP/TerrainLit_Basemap' not found
- Shader 'HDRP/TerrainLit': dependency 'BaseMapGenShader' shader 'Hidden/HDRP/TerrainLit_BasemapGen' not found