Bug description
While I have the sample count on the Abstract map set to max (255), the sidewalls show up as bars.

Steps to recreate the bug:
With sample abstract map component, with ElevationLayer type as "Terrain with elevation", and sample count = 255. If I enable "Show sidewalls", the walls show up as bars below the map. As attached below,
- Unity version: 2019.3.15
- Scripting Runtime Version: .NET 4.x
- Scripting Backend: IL2CPP
- Mapbox SDK version: 2.0.1
- The platform you're building to: Editor for now