Point mark doesn't work with ordinal bin

[kanitw]

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "data": {"url": "data/cars.json"},
  "transform": [{"calculate": "random()", "as": "random"}],
  
  "mark": "point",
  "encoding": {
    "x": {"field": "Horsepower","type": "quantitative"},
    "y": {"bin": true, "field": "Miles_per_Gallon","type": "ordinal"}
  }
}