Reproduction steps:
1. Open the attached “MeshCollidersDifferencePlayMode” project
2. Open the “Assets/Scenes/SampleScene” scene
3. In the Scene view, enable Gizmos
4. In the Hierarchy view, expand the RoadCollider subscene
5. Double-click the “Sphere” GameObject to focus the Scene view on it
6. Enter the Play mode
7. Observe the mesh in the Scene view

Expected Result: The mesh is fully green
Actual Result: Some mesh quads are displayed in cyan or purple

Reproducible with: 2022.3.48f1, 6000.0.21f1
Could not test with: 2021.3.44f1 (due to package errors when downgrading)

Reproducible on: Windows 11 Pro, macOS 14.6.1 (by reporter)
Not reproducible on: No other environments tested

Notes:
- Editor pauses when collision hits GhostCollisionMonitoringSystem.cs l.64
- Quad shaped checked in GhostCollisionMonitoringSystem.cs l.79 (magenta) and l.93 (cyan)

Discussions

• in #int-unity-physics here.
• in #prms-triage here