The scaling of istack and setIntervalRestrictions will result in negative values for istack 1, and it will break free from the setIntervalRestrictions restriction. istack 1 will experience axis data flipping.

Dragging and zooming with the mouse will cause this issue.

chart.yAxis.dispose();
let axisX = chart
  .getDefaultAxisX()
  .setInterval({
    start: 0,
    end: 10,
  })
  .setIntervalRestrictions({
    startMin: 0,
    endMax: 10,
  });

let axisYOne = chart
  .addAxisY({ iStack: 1 })
  .setInterval({
    start: 0,
    end: 10,
  })
  .setLength({
    pixels: 200,
  })
  .setIntervalRestrictions({
    startMin: 0,
    endMax: 10,
  });
let axisYTwo = chart
  .addAxisY({ iStack: 3 })
  .setInterval({
    start: 0,
    end: 10,
  })
  .setLength({
    pixels: 200,
  })
  .setIntervalRestrictions({
    startMin: 0,
    endMax: 10,
  });
chart
  .addLineSeries({
    yAxis: axisYOne,
  })
  .addArraysXY([1, 2, 3, 4, 5, 6, 7, 8], [1, 2, 3, 4, 5, 6, 7, 8]);
chart
  .addLineSeries({
    yAxis: axisYTwo,
  })
  .addArraysXY([1, 2, 3, 4, 5, 6, 7, 8], [1, 2, 3, 4, 5, 6, 7, 8]);