Bar chart with quantitative dimension and non-linear measure has wrong stack calculation

[kanitw]

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "A simple bar chart with embedded data.",
  "data": {
    "values": [
      {"a": 3000, "b": 55}, 
      {"a": 3500, "b": 28}, 
      {"a": 4000, "b": 55}
    ]
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "a", "type": "quantitative"},
    "y": {"field": "b", "type": "quantitative", "scale": {"type": "pow"}}
  }
}

Domain shouldn't go to 8000

[kanitw]

fixed in #8871