Reproduction steps:
1. Open the project from the attached file "1230996.zip"(link in edit)
2. Right-click on Assets and go to > Create > Shader > HDRP > Shader Lit
3. Open the newly created Shader Graph
4. Click Save Asset in the upper left corner of Shader Lit editor window
5. Inspect the Console

Expected result: No error is thrown in the Console
Actual result: - "Assertion failed on expression: 'state.originalObjectCount == (int)Object::GetLoadedObjectCount()'" and "UnloadUnusedAssets incorrect caused some assets to load. This can easily cause deadlocks or crashes." are thrown in the Console

Reproducible with: HDRP 8.0.1(2020.2.0a5, 2020.1.0b4), HDRP 7.3.1(2020.2.0a5, 2020.1.0b4, 2019.3.9f1), 7.2.1(2020.3.9f1), 7.2.0(2019.3.9f1)
Not reproducible with: HDRP 7.1.8(2020.2.0a5, 2019.3.9f1), HDRP 4.10.1-preview(2018.4.20f1)
Could not test with: 2017.4(no Package Manager)

Notes:
- Only reproducible once. To reproduce again you have to re-open the project and create a new Shader Graph.
- Not reproducible with other Shader Graphs