Wijmo 5 - Wijmo Calendar itemFormatter issue

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdn.grapecity.com/wijmo/5.latest/styles/wijmo.min.css">
<script src="https://cdn.grapecity.com/wijmo/5.latest/controls/wijmo.min.js"></script>
<script src="https://cdn.grapecity.com/wijmo/5.latest/controls/wijmo.input.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js"></script>
<div class="container">

  <h1>Wijmo Calendar itemFormatter issue</h1>
  <p>
    This jsFiddle uses the Calendar's <a href="https://www.grapecity.com/wijmo/api/classes/wijmo_input.calendar.html#itemformatter">itemFormatter</a> property to apply a yellow background to "today". But the yellow background is incorrectly applied to the <i>same cell in every month</i>, not just "today's" month.
  </p>
  <p>
    To see the issue, shuttle forward or back a month and note that one of the dates has a yellow background.
  </p>
  <p>
  See related <a href="https://www.grapecity.com/forums/wijmo/issue-with-calendar-itemfo_1">Wijmo Forum Post</a>.
  </p>

  <div id="theCalendar"></div>

</div>

CSS

.wj-calendar {
    max-width: 300px;
}
.wj-control {
  margin-bottom: 6px;
}
body {
  margin-bottom: 24pt;
}

JavaScript

onload = function() {

  // create Calendar control
  var calendar = new wijmo.input.Calendar('#theCalendar', {
    value: new Date(2020, 3, 1),

    itemFormatter: (date, element) => {
      const givenDay = moment(date);
      const today = moment();

      // reset the styling of Wijmo's td.wj-day-today cell
      if (givenDay.isSame(today, 'day')) {
        element.style.backgroundColor = 'yellow';
      }
      else {
      	element.style.backgroundColor = 'inherit';
      }

    }

  });

}