Crash on "PPtr<Shader>::operator Shader * __ptr64" when opening a project with specific Assets

How to reproduce:
1. Open the attached “IN-118592” project
2. Observe the crash

Reproducible with: 6000.3.0b3, 6000.3.2f1, 6000.4.0a1
Not reproducible with: 6000.0.64f1, 6000.3.0b2, 6000.4.0b1, 6000.5.0a3

Reproduced on: Windows 11
Not reproduced on: No other environment tested

Notes:

• It’s best to re-extract the project for each test as it will sometimes open successfully after opening with a non affected version
• The crash does not occur after deleting the “AhahGames“ folder (Assets > “AhahGames”)

First few lines of the stack trace:
0x00007FFB95E950F6 (Unity) PPtr<Shader>::operator Shader * __ptr64
0x00007FFB965C089D (Unity) Material::GetShader
0x00007FFB96AD3ECE (Unity) ShaderUtil::GetMaterialPropertiesImpl
0x00007FFB9699A195 (Unity) ShaderUtil_CUSTOM_GetMaterialPropertiesImpl