How to reproduce:
1. Open the user-submitted project
2. Open the scene "SampleScene" (Assets/Scenes/SampleScene.unity)
3. Enter Play mode

Expected result: The editor doesn't freeze
Actual result: The editor freezes

Reproducible with: 1.7.0-pre.1 (2020.3.25f1, 2021.2.7f1, 2022.1.0b2)
Not reproducible with: 1.6.3 (2020.3.25f1, 2021.2.7f1, 2022.1.0b2)
Could not test with: 1.6.3, 1.7.0-pre.1 (2019.4.34f1) (Error: The type 'AllocatorManager.AllocatorFunc' must be a non-nullable value type, along with all fields at any level of nesting, in order to use it as parameter 'T' in the generic type or method 'AllocatorManager.Array256<T>')