Reproduction steps:
1. Open the attached “IN-101032.zip” project
2. Right-click in the Project Window
3. Click Create > 2D > Sprite Atlas
4. Select the newly created Atlas
5. In the Inspector, change the “Max Texture Size” to “1024”
6. Expand the “Objects for Packing” tab and press the + symbol
7. Select the “Sprites” folder to add it to the list
8. Click “Pack Preview”
9. Observe the Atlas Preview

Expected result: The Sprite Atlas has one page
Actual result: The Sprite Atlas has two pages

Reproducible with: 2022.1.0a1, 2022.3.62f1, 6000.0.48f1, 6000.1.3f1, 6000.2.0b1

Reproducible on: Windows 11
Not reproducible on: no other environment tested