How to reproduce:
1. Open the "NavMeshSurfaceGizmo" project
2. Open the "SampleScene"
3. Ensure that "Show NavMesh" is enabled in the AI Navigation Overlay in the Scene view
4. Ensure that "NavMeshSurface" gizmo option is enabled in Gizmos menu in the Scene view
5. Select the "Plane" GameObject in the Hierarchy
6. Disable the "NavMeshSurface" gizmo option in the Gizmos menu in the Scene view
7. Observe the blue surface that still remains in the Scene view
Expected result: All blue surfaces will disappear
Actual result: The lighter blue surface remains (the unselected surface opacity is not turned off, only the selected surface opacity was turned off)
Reproducible in: 1.1.1, 2.0.9 (6000.0.59f1, 6000.2.10f1, 6000.3.0b8, 6000.4.0a3)
Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested