Steps to reproduce:
1. Open the attached project “IN-14036.zip“
2. Open the “Assets/Scene01.unity“ Scene
3. Enter Play Mode
4. Open Window > Analysis > Memory Profiler
5. In the Memory Profiler window click the “Capture New Snapshot“ button
6. Open the taken Snapshot and go to the “Objects and Allocations” tab
7. Sort the “Type“ column by “Sort Ascending“
8. Notice that there are no “AnimationClip” type assets in the memory
9. Exit Play Mode
10. Open the “Assets/Scene02.unity“ Scene
11. Repeat 3-7 steps
12. Notice that “AnimationClip1“ is now in the memory
13. Repeat 2-7 steps
14. Notice that “AnimationClip1“ is still in the memory

Expected result: “AnimationClip” type assets are released from the memory when exiting Play Mode
Actual result: “AnimationClip” type assets are not released

Reproducible with: 1.4.8 (2020.3.39f1), 1.6.4 (2021.3.9f1), 1.7.1 (2022.1.17f1, 2022.2.0b7, 2023.1.0a11)

Reproducible on: Windows 10

Notes:
1. Look at the attached video (“Memory.mp4“) for clarity
2. “AnimationClip” type assets are released when Timeline is not used