Reproduction steps:
1. Open the attached “repro_IN-78023“ project
2. Open the “Assets/OutdoorsScene.unity“
3. In the Hierarchy, select the “Quad“ GameObject
4. In the Animation window (“Window → Animation → Animation“), press the “Preview“ button in the top-left
5. In the Inspector, under the “Inputs“ (“Inspector → Material → Inputs“), observe the background colors of the parameters

Expected result: Background color of “Color“, “Value A“ and “Value B“ parameters is dark blue
Actual result: Background color of “Color“ and “ Value A“ parameters is dark blue while background color of “Value B“ parameter is not

Reproducible with: 2021.3.39f1, 2022.3.34f1, 6000.0.7f1

Reproducible on: Windows 10 (22H2)
Not reproducible on: No other environments tested

Notes:

* Same issue happens with the recording mode but with a dark red background color
* Mainly seems to affect extension methods from UnityEditor.Rendering.MaterialEditorExtension