Skeletons with segment_properties info not loading

Hi @jbms ,

When I try using `segment_properties` for skeletons, I do see the checked labels appearing on the segmentation tab but not the actual skeletons. Before adding the segment_properties as a sub resource, skeletons loaded okay. Could I be missing something in the segment_properties json configuration (https://github.com/google/neuroglancer/blob/8432f531c4d8eb421556ec36926a29d9064c2d3c/src/neuroglancer/datasource/precomputed/skeletons.md)?

`precomputed`
```
├── 1.gz
├── 3.gz
├── 4.gz
├── 5.gz
├── 6.gz
├── info
└── segment_properties
└── info
```

`precomputed/info`
```
{"@type": "neuroglancer_skeletons", "transform": [200, 0, 0, 0, 0, 200, 0, 0, 0, 0, 1000, 0], "vertex_attributes": [{"id": "radius", "data_type": "float32", "num_components": 1}], "segment_properties": "segment_properties"}
```

`precomputed/segment_properties/info`
```
{"@type": "neuroglancer_segment_properties", "inline": {"ids": ["1","3","4","5","6"], "properties": [{"id": "label", "type": "label", "values": ["neuron1","neuron3","neuron4","neuron5","neuron6"] }]}}
```

Thank you,
m