The pointer transform doesn’t work if non-faceted in a faceted plot

[mbostock]

E.g., here I would expect the pointer to highlight the same rule across facets. But instead the pointer’d rule is not displayed at all.

Plot.plot({
  marks: [
    Plot.lineY(aapl, {x: "Date", y: "Close", fy: d => (d.Close % 2) === 0}),
    Plot.ruleX(aapl, {x: "Date", strokeOpacity: 0.1}),
    Plot.ruleX(aapl, Plot.pointerX({x: "Date", _fy: d => (d.Close % 2) === 0, stroke: "red"})),
  ]
})

https://observablehq.com/d/82e93a91379bd230