CLNDR事件未传递给Safari的点模板

I am using https://kylestetz.github.io/CLNDR/ with a http://olado.github.io/ template, and the events array doesn't appear to be returning for Safari and Firefox browsers. I verified this using console.log(day), and the events array is empty for these browsers only. Chrome works perfectly though.

Here is my DOT template:

<script id="dot-template" type="text/template">
    <div id="clndr-3">
        <div class="clndr-grid">
            <div class="days-of-the-week">
                <div class="days">
                    {{~it.days :day:index}}
                        {{? day.events.length }}
                            <a href="{{= day.events[0].url }}">
                                <div class="{{= day.classes }}">{{= day.day }}</div>
                            </a>
                        {{??}}
                            <div class="{{= day.classes }}">{{= day.day }}</div>
                        {{?}}
                    {{~}}
                </div>
            </div>
        </div>
    </div>
</script>

Here is my JS:

<script type="text/javascript">
    jQuery(document).ready(function($){
        let clndrTemplate = doT.template($('#dot-template').html()),
            events = <?= json_encode($calendar_array); ?>,

        let theCalendarInstance = jQuery('#clndr').clndr({
            template: jQuery("#clndr-template"),
            events: events,
            render: function (data) {
                return clndrTemplate(data);
            },
        });   
    });
</script>

My events array is building with PHP:

<?php
$calendar_array = array();
foreach( $events as $event ) :
    $event_id = $event->ID;
    $event_title = $event->post_title;
    $event_date = tribe_get_start_date($event_id, false, 'l, F j, Y');

    $calendar_array[] = array(
        'date' => date('m-d-Y', strtotime($event_date)),
        'title' => $event_title,
        'url' => get_the_permalink($event_id)
    );
endforeach;
?>

The calendar will initiate for all browsers, however, the events aren't being passed to the DOT template in Safari and Firefox.