Chart.js with x, y coordinates, getElementsAtEventForMode returns elements for index, not for event x coordinate

Question

The data I work with, comes in formats like this:

 {
        label: 'red',
        data: [
          { x: 1, y: 2 },
          { x: 1.5, y: 1 },
          { x: 2, y: 2 },
          { x: 2.5, y: 2 },
        ],
      },
      {
        label: 'blue',
        data: [
          { x: 1, y: 4 },
          { x: 2, y: 3 },
          { x: 3, y: 4 },
          { x: 4, y: 3 },
        ],
}

X-axis is linear, and the x-values step size is undetermined. Chart.js can detect the correct labels fine and draws the lines correctly. But when I try to use getElementsAtEventForMode to get signals at a certain x coordinate, like this:

const signalsAtPoint = chart.getElementsAtEventForMode(
                event as unknown as Event,
                'index',
                { intersect: false },
                false 
              );
signalsAtPoint.forEach((signal) => {
            console.log(
              chart.data.datasets[signal.datasetIndex].data[signal.index]
            );
          });

It finds the index of first signal and for each signal, returns the data at that index in the signals own coordinates. So if I click at blue[2], I expect to get only one signal as a response, because red signal doesn't exist anymore at x-value 3. But instead I get { x:2, y:2 } for red signal, because that is what exists at index location 2 in the red array. https://stackblitz.com/edit/chart-js-version-3-pjyozz

Is this intended behavior? It is most definitely not getting "elements at event". Is mismatching x-axis values a thing that should not be done, even though the chart can correctly draw those kind of charts?