Steps to reproduce:
1. Open attached project "rqa-project-nightwalker.zip"
2. In Project window, open Assets/Effects/Dissolve/DissolveShader.shadergraph
3. In ShaderGraph's property list, select the "DissolveColor" property
4. In Graph Inspector, open the selector for DissolveColor's "Default" color
5. By using the input field, set the color's intensity to 1000
6. In ShaderGraph window, Save Asset
7. Repeat steps 3-5, but set the intensity to 7
8. In ShaderGraph window, Save Asset
9. Observe ShaderGraph Previews, and Console window

Expected result: No errors, DissolveShader's Previews returns back to normal
Actual result: "Parse error: syntax error, unexpected TVAL_ID, expecting TVAL_NUMBER" error, DissolveShader's Previews break

Reproducible with: 10.10.1 (2020.3.47f1), 12.1.11 (2021.3.23f1), 14.0.7 (2022.2.16f1), 15.0.5 (2023.1.0b13), 16.0.1 (2023.2.0a11)

Notes:
1. If you attempt to undo the operation that sets the intensity in the repro (steps 7-8), the entire ShaderGraph breaks irreversibly
2. In 2020.3.47f1, the ShaderGraph's Previews are broken, but there is no error