Reproduction steps:
1. Open the attached “IN-95207.zip” project
2. From the Project Window select Assets > Atlases > “Sprite Atlas Variant.spriteatlasv2”
3. In the Inspector, make the Preview of the Texture as big as possible for better visibility
4. Observe the “MainTex” Texture in the Preview
5. In the Preview Window switch from “MainTex” to “_16Bit”
6. Observe the “_16Bit” Texture in the Preview

Expected result: The “_16Bit” Texture Preview does not have a banding effect and is different from the “MainTex” (8-bit)
Actual result: No difference is visible between the “MainTex” (8-bit) and “_16Bit” (16-bit) textures and the banding effect is still visible with the 16-bit texture

Reproducible with: 2022.3.58f1, 6000.0.39f1, 6000.1.0b7, 6000.2.0a4

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note:
- This issue was already reported: https://issuetracker.unity3d.com/product/unity/issues/guid/UUM-73396 and was fixed for the Master Atlas, which can be confirmed by selecting “Sprite Atlas.spriteatlasv2” and testing with the steps above. But when viewing Variant Atlas, the issue still reproduces