How to reproduce:
1. Open the attached "IN-151203_63hd.zip" project
2. Open the "SampleScene"
3. In the Project Settings, enable any MSAA mode (Edit -> Project Settings -> Graphics -> HDRP -> Multisample Anti-Aliasing Quality)
4. In Game view, observe the border between the background sky and the visible cube
Actual result: A dark outline appears on the border between the mesh and the background sky
Expected result: No dark outline is visible on the border between the mesh and the background sky
Reproducible with: 6000.0.83f1, 6000.1.0a2, 6000.3.23f1, 6000.5.11f1, 6000.6.0f1, 6000.7.0a6
Not reproducible with: 6000.1.0a1
Reproducible on: Windows 11
Not reproducible on: No other environments tested
Note: The issue does not reproduce if "Lit Shader Mode" is set to "Deferred Only"