VectorTile.cs displays an error when working in Debug mode

[worleywa7]

https://github.com/mapbox/vector-tile-cs/blob/master/src/VectorTileReader/VectorTile.cs

When working on getting a Vector Tile data from the api, and after trying to pass the Byte Array data along to the Vector Tile constructor, I noticed the VectorTile has the following error displayed in the variables display whilst debugging:
error CS0103: The name 'Zoom' does not exist in the current context/error CS0103: The name 'TileColumn' does not exist in the current context/error CS0103: The name 'TileRow' does not exist in the current context

I can still use the VectorTile, as I discovered later, but it definitely threw me off when I saw this. Any idea why this is happening?