Reproduction steps:
1. Open the attached “SpriteAtlasPreview.zip“ project
2. Select the “SpriteAtlas“ asset in the Project window
3. In the Inspector add a new object to the “Objects for Packing” list
4. Click “Pack Preview” and observe the Asset Preview window
5. Remove an old object from the “Objects for Packing” list
6. Click “Pack Preview” and observe the Asset Preview window
Expected result: The Asset Preview window is updated in steps 4 and 6
Actual result: The Asset Preview window is not updated in steps 4 and/or 6
Reproducible with: 2022.2.0a6, 2022.2.0a18, 2023.1.0a1
Not reproducible with: 2020.3.36f1, 2021.3.5f1, 2022.1.7f1, 2022.2.0a5
Reproduced on: Windows 11, macOS Monterey 12.0.1 (Intel)
Workaround: Reimport the Sprite Atlas asset
Note: At first, the issue was only when adding or removing objects for packing. In the current trunk (2023.1.0a1), it's reproducible by changing most packing settings