How to reproduce:
1. Open the attached “AnimationClipBug.zip“ project
2. Open the Memory Profiler (Window>Analysis>Memory Profiler)
3. Select the Screenshot on the left of the Memory Profiler window
4. Select the “Object and Allocations“ tab
5. Go to the Object list view and sort descending by size
6. Find an AnimationClip named “IdleBase”
Expected result: Size of the AnimationClip is around 0 bytes
Actual result: Size of the AnimationClip is 4.7 kilobytes
Reproducible with: 2021.3.28f1, 2022.3.4f1, 2023.1.3f1, 2023.2.0a23
Reproduced on: macOS 13.4.1 (Intel, M1)
Note: If creating a new AnimationClip, the size of it may change depending on the minimum block size of your computer's disk format