The main thread gets locked after calling CullingGroup.targetCamera which causes asset reload after GC

Reproduction steps:

1. Build the Editor with source code
2. Open <repositorypath>/unity/Projects/VisualStudio/Editor-unity.sln and open PersistentManager.cpp
3. Place a breakpoint in the PersistentManager::Lock method and disable it
4. Run the user’s attached project by pressing Local Windows Debugger and selecting the project from Hub
5. Open Assets/SampleScene
6. Enter Play Mode and wait for a few seconds
7. Enable the breakpoint
8. Check the callstack

Expected result: CullingGroup.targetCamera does not lock the main thread
Actual result: the main thread locks the PersistentManager before determining that the CullingGroup.targetCamera is null

Reproducible with: 2020.3.38f1, 2021.3.8f1, 2022.1.14f1, 2022.2.0b4, 2023.1.0a6

Reproducible on: Windows 11

Note:

• the 2023.1 stream reproduces with a slightly different callstack but the main thread is still being locked
• reproduces in the Editor and in the Player