Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. Open Profiler (Window > Analysis > Profiler)
4. Enable “Deep Profile”
5. Enter the Play Mode
6. Pause the Play Mode
7. Click the CPU Usage graph to add a point
8. In the Timeline drop-down select “Hierarchy“
9. Search for “GraphPasses“
10. Observe GC Alloc size

Expected result: “NativePassData.GraphPasses()” GC Alloc size is 0 B
Actual result: “NativePassData.GraphPasses()” has GC Alloc of ~256 B

Reproducible with: 6000.0.15f1, 6000.0.35f1, 6000.1.0b3
Not reproducible with: 2022.3.56f1, 6000.0.14f1

Reproducible on:
Play mode

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:
- Could not test Windows Standalone Player due to it not connecting to Profiler with Development mode, Profiler support and Deep Profile selected
- Discussions thread: https://discussions.unity.com/t/rendergraph-many-allocations-per-frame/1551761