How to reproduce:
1. Create a new project
2. Install Shader Graph package: Window > Package Manager
3. Create Blank Shader Graph asset: Assets > Create > Shader Graph > Blank Shader Graph
4. Open the created Shader Graph

Expected result: Font in the Shader Graph window doesn't contain any artifacts
Actual result: Font in the Shader Graph window contains artifacts

Reproducible with: 12.0.0 (2022.1.0a5), 13.1.3 (2022.1.0b2), 13.1.6 (2022.1.0b10), 14.0.0 (2022.2.0a3)
Not reproducible with: 7.7.1 (2019.4.34f1), 10.8.1 (2020.3.26f1), 12.1.4 (2021.2.10f1), 12.0.0 (2022.1.0a4), 14.0.0 (2022.2.0a4), 14.0.1 (2022.2.0a8)