Steps to reproduce:
1. Open the attached user's project "ToolkitBandingBug.zip"
2. Open the "SceneBug" Scene
3. Select the "PanelRendered" GameObject in the Hierarchy
4. In the Inspector Window, select the Source Asaset "GradientView"
5. Enter Play Mode
6. Observe the gradient background
Actual result: clearly separated color bands are visible across the UI Toolkit gradient
Expected result: The gradient appears smooth, without prominent quantization bands
Reproducible with: 6000.7.0a5
Could not test with 6000.0.82f1, 6000.3.22f1, 6000.5.9f1, 6000.6.0b9 due to GradientView Source asset not rendering
Testing Environment: Windows 11, M1 macOS 26.6
Not reproducible on: no other environment tested
Notes:
-Reproducible with DX12, DX11, Vulkan on Windows. On M1 MacOS 26.6 Metal - issue is more apparent, but on Windows is also observable
-Most visible with wide, dark, low-contrast linear-gradient or radial-gradient