How to reproduce:
1. Open the user's attached project
2. Open scene Scenes/SampleScene
3. Go to Window -> Rendering -> Lighting
4. In the Lighting window, select the Environment tab and go to Other Settings
5. Disable Fog
6. In the Hierarchy window, double-click the GameObject "Decal"
7. Observe the appearance of the Decal in the Scene view
8. Enable Fog again
9. Repeat step 7

Expected result: the Decal illustration is visible both with and without Fog
Actual result: the Decal area becomes solid grey when Fog is enabled

Reproducible with: 2021.2.5f1, 2022.1.0a16
Could not test with: 2019.4.33f1 (error CS0115: 'CustomRenderPassFeature.CustomRenderPass.OnCameraSetup(CommandBuffer, ref RenderingData)': no suitable method found to override), 2020.3.24f1 (UniversalRenderer is missing RendererFeatures)