Importing Shader Graph samples from HDRP package sample throws missing material property errors. Refer the screenshot attached

Steps to reproduce:
1) Create a new project
2) Window > Package Manager > Install HDRP 9.0.0-preview.13 (latest)
3) Import "Shader Graph samples" from package samples.

Actual Result: Missing material property errors are thrown

Expected Result: No errors should be thrown in console

Occurring in: 2020.2.0a8, 2020.1.0b6 with HDRP package version 9.0.0-preview.13

Working fine in: 2020.2.0a8, 2020.1.0b6 with HDRP package version 8.0.1

Environment: Occurring on Windows. Couldn't test on Mac due to https://fogbugz.unity3d.com/f/cases/1225704/