Properties are missing on converting to topoJSON

[dihar]

When I convert geoJSON to topoJSON feature's properties disappear.
You can try this json:

{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"timezone":-12},"geometry":{"type":"Polygon","coordinates":[[[-180,-89],[-180,89],[-165.6,89],[-165.6,-89],[-180,-89]]]}},{"type":"Feature","properties":{"timezone":-11},"geometry":{"type":"Polygon","coordinates":[[[-165.6,-89],[-165.6,89],[-151.2,89],[-151.2,-89],[-165.6,-89]]]}},{"type":"Feature","properties":{"timezone":-10},"geometry":{"type":"Polygon","coordinates":[[[-151.2,-89],[-151.2,89],[-136.8,89],[-136.8,-89],[-151.2,-89]]]}},{"type":"Feature","properties":{"timezone":-9},"geometry":{"type":"Polygon","coordinates":[[[-136.8,-89],[-136.8,89],[-122.4,89],[-122.4,-89],[-136.8,-89]]]}},{"type":"Feature","properties":{"timezone":-8},"geometry":{"type":"Polygon","coordinates":[[[-122.4,-89],[-122.4,89],[-108,89],[-108,-89],[-122.4,-89]]]}},{"type":"Feature","properties":{"timezone":-7},"geometry":{"type":"Polygon","coordinates":[[[-108,-89],[-108,89],[-93.6,89],[-93.6,-89],[-108,-89]]]}},{"type":"Feature","properties":{"timezone":-6},"geometry":{"type":"Polygon","coordinates":[[[-93.6,-89],[-93.6,89],[-79.19999999999999,89],[-79.19999999999999,-89],[-93.6,-89]]]}},{"type":"Feature","properties":{"timezone":-5},"geometry":{"type":"Polygon","coordinates":[[[-79.2,-89],[-79.2,89],[-64.8,89],[-64.8,-89],[-79.2,-89]]]}},{"type":"Feature","properties":{"timezone":-4},"geometry":{"type":"Polygon","coordinates":[[[-64.8,-89],[-64.8,89],[-50.400000000000006,89],[-50.400000000000006,-89],[-64.8,-89]]]}},{"type":"Feature","properties":{"timezone":-3},"geometry":{"type":"Polygon","coordinates":[[[-50.400000000000006,-89],[-50.400000000000006,89],[-36,89],[-36,-89],[-50.400000000000006,-89]]]}},{"type":"Feature","properties":{"timezone":-2},"geometry":{"type":"Polygon","coordinates":[[[-36,-89],[-36,89],[-21.599999999999994,89],[-21.599999999999994,-89],[-36,-89]]]}},{"type":"Feature","properties":{"timezone":-1},"geometry":{"type":"Polygon","coordinates":[[[-21.599999999999994,-89],[-21.599999999999994,89],[-7.199999999999989,89],[-7.199999999999989,-89],[-21.599999999999994,-89]]]}},{"type":"Feature","properties":{"timezone":0},"geometry":{"type":"Polygon","coordinates":[[[-7.199999999999989,-89],[-7.199999999999989,89],[7.200000000000017,89],[7.200000000000017,-89],[-7.199999999999989,-89]]]}},{"type":"Feature","properties":{"timezone":1},"geometry":{"type":"Polygon","coordinates":[[[7.200000000000017,-89],[7.200000000000017,89],[21.600000000000023,89],[21.600000000000023,-89],[7.200000000000017,-89]]]}},{"type":"Feature","properties":{"timezone":2},"geometry":{"type":"Polygon","coordinates":[[[21.599999999999994,-89],[21.599999999999994,89],[36,89],[36,-89],[21.599999999999994,-89]]]}},{"type":"Feature","properties":{"timezone":3},"geometry":{"type":"Polygon","coordinates":[[[36,-89],[36,89],[50.400000000000006,89],[50.400000000000006,-89],[36,-89]]]}},{"type":"Feature","properties":{"timezone":4},"geometry":{"type":"Polygon","coordinates":[[[50.400000000000006,-89],[50.400000000000006,89],[64.80000000000001,89],[64.80000000000001,-89],[50.400000000000006,-89]]]}},{"type":"Feature","properties":{"timezone":5},"geometry":{"type":"Polygon","coordinates":[[[64.80000000000001,-89],[64.80000000000001,89],[79.19999999999999,89],[79.19999999999999,-89],[64.80000000000001,-89]]]}},{"type":"Feature","properties":{"timezone":6},"geometry":{"type":"Polygon","coordinates":[[[79.19999999999999,-89],[79.19999999999999,89],[93.59999999999997,89],[93.59999999999997,-89],[79.19999999999999,-89]]]}},{"type":"Feature","properties":{"timezone":7},"geometry":{"type":"Polygon","coordinates":[[[93.60000000000002,-89],[93.60000000000002,89],[108,89],[108,-89],[93.60000000000002,-89]]]}},{"type":"Feature","properties":{"timezone":8},"geometry":{"type":"Polygon","coordinates":[[[108,-89],[108,89],[122.39999999999998,89],[122.39999999999998,-89],[108,-89]]]}},{"type":"Feature","properties":{"timezone":9},"geometry":{"type":"Polygon","coordinates":[[[122.40000000000003,-89],[122.40000000000003,89],[136.8,89],[136.8,-89],[122.40000000000003,-89]]]}},{"type":"Feature","properties":{"timezone":10},"geometry":{"type":"Polygon","coordinates":[[[136.8,-89],[136.8,89],[151.2,89],[151.2,-89],[136.8,-89]]]}},{"type":"Feature","properties":{"timezone":11},"geometry":{"type":"Polygon","coordinates":[[[151.2,-89],[151.2,89],[165.59999999999997,89],[165.59999999999997,-89],[151.2,-89]]]}},{"type":"Feature","properties":{"timezone":12},"geometry":{"type":"Polygon","coordinates":[[[165.60000000000002,-89],[165.60000000000002,89],[180,89],[180,-89],[165.60000000000002,-89]]]}}]}

Thanks for feedback!