Use Get Symbol From JSON with a CIM symbol

Does anyone have an example that shows how to get a symbol from a CIM symbol definition in JSON? When I try to load a JSON generated in the Symbol Builder , Get Symbol From JSON returns a symbol with type="cim"; color=[0,0,0] and data=null. All other properties from the JSON seem to be ignored.

All other types of symbol, e.g. a SimpleLineSymbol work fine.

Here's an example JSON

{
  "type": "CIMLineSymbol",
  "symbolLayers": [
    {
      "type": "CIMVectorMarker",
      "enable": true,
      "anchorPointUnits": "Relative",
      "dominantSizeAxis3D": "Y",
      "size": 7,
      "billboardMode3D": "FaceNearPlane",
      "markerPlacement": {
        "type": "CIMMarkerPlacementOnLine",
        "angleToLine": true,
        "relativeTo": "LineMiddle"
      },
      "frame": {
        "xmin": -5,
        "ymin": -5,
        "xmax": 5,
        "ymax": 5
      },
      "markerGraphics": [
        {
          "type": "CIMMarkerGraphic",
          "geometry": {
            "rings": [
              [
                [0,5],
                [0.87,4.92],
                [1.71,4.7],
                [2.5,4.33],
                [3.21,3.83],
                [3.83,3.21],
                [4.33,2.5],
                [4.7,1.71],
                [4.92,0.87],
                [5,0],
                [4.92,-0.87],
                [4.7,-1.71],
                [4.33,-2.5],
                [3.83,-3.21],
                [3.21,-3.83],
                [2.5,-4.33],
                [1.71,-4.7],
                [0.87,-4.92],
                [0,-5],
                [-0.87,-4.92],
                [-1.71,-4.7],
                [-2.5,-4.33],
                [-3.21,-3.83],
                [-3.83,-3.21],
                [-4.33,-2.5],
                [-4.7,-1.71],
                [-4.92,-0.87],
                [-5,0],
                [-4.92,0.87],
                [-4.7,1.71],
                [-4.33,2.5],
                [-3.83,3.21],
                [-3.21,3.83],
                [-2.5,4.33],
                [-1.71,4.7],
                [-0.87,4.92],
                [0,5]
              ]
            ]
          },
          "symbol": {
            "type": "CIMPolygonSymbol",
            "symbolLayers": [
              {
                "type": "CIMSolidFill",
                "enable": true,
                "color": [0,0,0,255]
              }
            ]
          }
        }
      ],
      "scaleSymbolsProportionally": true,
      "respectFrame": true
    },
    {
      "type": "CIMVectorMarker",
      "enable": true,
      "anchorPoint": {
        "x": 0.0004438008035129969,
        "y": -0.000005729214410147658,
        "z": 0
      },
      "anchorPointUnits": "Relative",
      "dominantSizeAxis3D": "Y",
      "size": 24,
      "billboardMode3D": "FaceNearPlane",
      "markerPlacement": {
        "type": "CIMMarkerPlacementAtExtremities",
        "angleToLine": true,
        "extremityPlacement": "Both",
        "offsetAlongLine": -6
      },
      "frame": {
        "xmin": -295,
        "ymin": -300,
        "xmax": 294,
        "ymax": 300
      },
      "markerGraphics": [
        {
          "type": "CIMMarkerGraphic",
          "geometry": {
            "rings": [
              [
                [142.1,93],
                [-83.5,0.4],
                [142.1,-93],
                [142.1,-145.5],
                [-142.4,-23.9],
                [-142.4,25.3],
                [142.1,145.5],
                [142.1,93]
              ]
            ]
          },
          "symbol": {
            "type": "CIMPolygonSymbol",
            "symbolLayers": [
              {
                "type": "CIMSolidStroke",
                "enable": true,
                "capStyle": "Round",
                "joinStyle": "Round",
                "lineStyle3D": "Strip",
                "miterLimit": 10,
                "width": 0,
                "color": [0,0,0,255]
              },
              {
                "type": "CIMSolidFill",
                "enable": true,
                "color": [0,0,0,255]
              }
            ]
          }
        }
      ],
      "scaleSymbolsProportionally": true,
      "respectFrame": true
    },
    {
      "type": "CIMSolidStroke",
      "enable": true,
      "capStyle": "Square",
      "joinStyle": "Round",
      "lineStyle3D": "Strip",
      "miterLimit": 10,
      "width": 2,
      "color": [0,0,0,255]
    }
  ],
  "animations": []
}