How to reproduce:
1. Create a new project with the SRP template (i.e. URP)
2. In the Project Window, create an Unlit Shader Graph (Create->Shader->Universal Render Pipeline->Unlit Shader Graph)
3. Select the created Shader
4. Preview it in the Inspector

Expected result: No errors are thrown inside of the Shader
Actual result: Multiple "implicit truncation of vector type" errors are thrown

Reproducible with: 10.3.1 (2020.2.7f1), 11.0.0 (2021.1.0b9, 2021.2.0a1)
Not reproducible with: 7.5.3 (2019.4.21f1)

Note: Error is shown with a warning icon