Crash when selecting a Material Variant whose grandparent has been deleted

Reproduction steps:
1. Open the attached “ReproroProj” project
2. Delete “Assets/parent.mat”
3. When the Editor promts, press “Delete Only”
4. In the project window, select “Assets/childchild.mat”

Expected result: A missing parent error is thrown
Actual result: The Editor crashes

Reproducible with: 2022.2.0a7, 2022.3.42f1, 6000.0.15f1
Not reproducible with: 2021.3.42f1, 2022.2.0a6

Reproducible on: macOS 14.6 (M1 Max)
Not reproducible on: No other environment tested