Stroked + Filled shape doesn't render correctly

[alexjlockwood]

Actual:

Expected:

{
  "version": 1,
  "layers": {
    "vectorLayer": {
      "id": "1",
      "name": "vector",
      "type": "vector",
      "children": [
        {
          "id": "3",
          "name": "path",
          "type": "path",
          "pathData": "M 4 4 L 20 4 L 20 20 L 4 20 L 4 4 M 8 8 L 16 8 L 16 16 L 8 16 L 8 8 Z",
          "fillColor": "#d8d8d8",
          "strokeColor": "#979797",
          "strokeWidth": 1
        }
      ]
    },
    "hiddenLayerIds": []
  },
  "timeline": {
    "animation": {
      "id": "2",
      "name": "anim",
      "duration": 300,
      "blocks": []
    }
  }
}