lockDays in Litepicker Js

Using Litepicker (https://github.com/wakirin/litepicker/) I’m having troubles adding lockDays to my calendar.
I’m retrieving some data from my DB and this is the JSON answer:

{
    "error":0,
    "reservation_counter":1,
    "reservations":[
        {
            "start_date":"2022-02-28 00:00:00",
            "end_date":"2022-03-02 00:00:00"
        }
    ]
}

Then I format the dates fields with this JS script

const obj = JSON.parse(result);
if(parseInt(obj.error) === 0) {
    var lockedArray = [];
    if(parseInt(obj.reservation_counter) > 0){
        for (let i = 0; i < parseInt(obj.reservation_counter); i++) {
            let subArray = [obj.reservations[i].start_date.slice(0, 10), obj.reservations[i].end_date.slice(0, 10)];
            lockedArray.push(subArray);
        }
    }
}

The output of this code is, as string: [["2022-02-28", "2022-03-02"]], so is compliant with the Litepicker format.

To render the calendar, I use this script:

$('input[name="litepicker"]').daterangepicker({
    parentEl: "#calendarelement-div",
    opens: 'center',
    inlineMode: false,
    minDate: new Date(),
    autoUpdateInput: true,
    singleMode: false,
    locale: {
        format: "DD/MM/YYYY",
        separator: " - "
     },
     lockDaysFormat: 'YYYY-MM-DD',
     lockDays: lockedArray,
     disallowLockDaysInRange: true,
     highlightedDays: lockedArray
});

The calendar is fully working, but it not locks the dates. I tried with hand-coded dates, but nothing.
This is an image of the result:

The expected resut is dates between 2022-02-28 and 2022-03-02 are locked, as JSON data.