Steps to reproduce:

1. Import the attached VFX to the project and make sure that VFX is not open
2. Drag VFX to the scene
3. Close the project and reopen it
4. Double click on that warning in the console

Actual results:  Error is thrown

Reproducible with versions: 6000.2.0a5, 6000.0.33f1

Not reproducible with versions: 2022.3.59f1 (couldn't get a warning thrown to the console)

Can’t test with versions: n/a

Tested on (OS): macOS, Windows

Notes:

• Severity and prevalence fields might be incorrect. This error might reveal a bigger issue after investigation.
• Error that needs to be investigated:
• Invalid shader source index

UnityEditor.VFX.VisualEffectResource:ShowGeneratedShaderFile (int,int)
VisualEffectAssetEditor:OnOpenVFX (int,int) (at /Users/vita.skruibyte/Documents/unity/packages/com.unity.visualeffectgraph/Editor/Inspector/VFXAssetEditor.cs:153)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)