Unity serialization crashes Editor while attempting to read specific type

Unity: Serialization

6.0.X

2023.2.X

2023.1.X

2022.3.X

2022.2.X

2021.3.X

2021.1.X

1. Open attached project
2. Open Test2 scene
3. Select "GameObject" GameObject
4. Expand Object1 collection in the Inspector
==> Editor crashes

Reproducible in 2021.2.0b13
Not reproducible in 2021.1.28f1.3303