To reproduce:
1. Open the project “Alembic Memory leak”
2. Open the Memory Profiler window (Window → Analysis → Memory Profiler)
3. Open and run the "Empty" scene
4. Take a snapshot in the Memory Profiler
5. Press 1 on the keyboard to change to a scene containing Alembic animations
6. Press 2 on the keyboard to go back to the empty scene
7. Take a snapshot in the Memory Profiler
8. Notice System.Int32\[] block size (select Snapshot → Tree Map)

Expected result: System.Int32\[] block size at the 7th and 12th steps is the same
Actual result: System.Int32\[] block size at the 12th step is almost twice as big as at the 7th step

Reproducible with: 2.2.2 (2020.3.36f1, 2021.3.6f1), 2.3.0 (2022.1.9f1, 2022.2.0a18)
Could not test with: 2023.1.0a2 (Could not find Tree Map)

Reproduced on: macOS Monterey 12.4 (Intel)

Note: After repeating 5, 6, 7 steps each time System.Int32\[] size increases