Some Memory Snapshots can hang in the GC.Handles processing phase.

How to reproduce:
1. Create and open a new project
2. Install the Memory Profiler preview package, either via package manager (pre 2021.1) or via the package manifest
- https://docs.unity3d.com/Packages/com.unity.memoryprofiler@latest/
3. Click Import to load the attached snapshot
4. Open the imported snapshot

Expected result: The snapshot is opened within max 10 min.
Actual result: The snapshot is not opened and the process is stuck in the GC.Handles processing step.

Reproducible with:andy Unity version newer than 2018.3 + the Memory Profiler package between versions 0.2.2-preview.1 and 0.2.7-preview.1 (inclusive)
Not reproducible with: 0.2.1-preview.1