amCharts4: Date axis grid not showing every month

Question

I'm not being able to specify where the grid lines should go for my date axis in amCharts 4. Here is my code:

let dateAxis = this.chart.xAxes.push(new am4charts.DateAxis());
dateAxis.dataFields.date="submittedDtm";
dateAxis.gridIntervals.setAll([
    { timeUnit: "month", count: 1 },
]);

As you can see I'm trying to make the chart have a grid line for every month. But instead, I only get grid lines for April, July, October, and next January:

enter image description here

This is for the data points "2023-04-05 14:48:00" and "2023-12-05 14:46:00".

In addition, my gridIntervals seems to cause my data to group into months, even though as I understand it, that's only supposed to happen if I set dateAxis.groupData = true; and set the appropriate dateAxis.groupIntervals.

I've tried many things such as dateAxis.groupData = true; and dateAxis.renderer.grid.template.location = 0.5;. Currently I don't have dateAxis.renderer.minGridDistance set to anything, but I've tried different values for that and it didn't work either.

EDIT: Resolved. This was an issue with data granularity. Even though my data is given with accuracy to the second, since I only gave a small number of data points, amcharts thought my granularity was much larger. When I set my base interval with

dateAxis.baseInterval = {
            "timeUnit": "second",
            "count": 1
}

it now works correctly.