How to reproduce:
1. Open the "cinemachinebrain_gc" project
2. Open the "SampleScene"
3. Open the Profiler (Window > Analysis > Profiler)
4. Enter Play Mode, wait 1 second, and Pause Game mode
5. Observe the CPU Usage section in the Profiler
6. In Hierarchy find "Main Camera" GameObject and enable the "CinemachineBrain" component
7. Unpause Game Mode and wait for 1 second
8. Pause the Game Mode again and observe the Profiler again

Expected result: Garbage Collection does not occur
Actual result: Garbage Collection always occurs when the “CinemachineBrain” component is enabled

Reproduced with: 2.5.0 (2020.3.46f1), 2.6.11 (2020.3.46f1), 2.9.5 (2020.3.46f1, 2021.3.22f1), 3.0.0-pre.4 (2022.2.13f1, 2023.1.0b10, 2023.2.0a8)

Reproduced on: Windows 11

Note: The size of GC is consistently at 368 bytes