3D buildings are rendered over features

[vesnikos]

The buildings are rendered over features. Here's a screenshot of the effect.

Test geojson:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -0.049438481,
              51.513446334
            ],
            [
              -0.049438481,
              51.513659994
            ],
            [
              -0.049095158,
              51.513659994
            ],
            [
              -0.049095158,
              51.513446334
            ],
            [
              -0.049438481,
              51.513446334
            ]
          ]
        ]
      }
    }
  ]
}