Reproduction steps:
1. Open the attached project "ReproProj"
2. In the Project window, select the “New Sprite Atlas”
3. In Inspector, add “Assets/Flag.png“ and “Assets/WhiteUnit.png“ to the “Objects for Packing“ field
4. Click the “Pack Preview” Button
5. Observe the Console

Expected result: No Warnings exist
Actual result: Warning is present “New Sprite Atlas: There is a mismatch in secondary textures of sprites compared to WhiteUnit, wasting texture space and potentially break draw call batching. Affected Sprites are (Flag)“

Reproducible with: 2022.3.55f1, 6000.0.32f1, 6000.1.0a9

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested