How to reproduce:
1. Open “IN-95508_Unity6BugReport 2“ project
2. Open “SampleScene”
3. In Project Settings > Editor > Sprite Atlas Mode select "Sprite Atlas V1 - Always Enabled"
4. Enter Play mode
5. Observe result

Expected result: Image does not artefact
Actual result: A horizontal artefact is visible

Reproducible with: 6000.0.9f1, 6000.0.39f1, 6000.1.0b7, 6000.2.0b4
Not reproducible with: 2021.3.49f1, 2022.3.58f1, 6000.0.8f1

Reproducible on: macOS 15.3 (M1 Max), Windows 11
Not reproducible on: no other environments tested

Notes:
- Also reproducible with “Sprite Atlas V2 - Enabled”
- Reproducible with all sprite formats except “RGBA 32bit”