[BUG] ShaderNode using ShaderGraph's shaders are broken when compiling Mixture for the first time

[felixcantet]

Describe the bug
All ShaderGraph nodes, as Normal From Height Node are broken when compile Mixture for the first time or when reimport package (I got this bug two times, when I cloned the repo the first time and when reimport project due to Unity Version mismatch).
Nodes don't output anything (or output a transparent texture ?)

Fix
To fix it, I simply open any ShaderGraph and save it. This fix every occurrence of the bug

To Reproduce
Steps to reproduce the behavior:

• Clone the repository
• Create a new graph
• Add any ShaderGraph Node
• Connect it to another node
• Output is a full (0, 0, 0, 0) map

Setup:

• OS: Windows
• Unity Version: 2020.3.2
• Render Pipeline : Built-In