FullCalendar error when switching from daygrid to timegrid

If I change the default calendar from daygrid to timegrid the head content does not change correctly, and therefore I get the following error.

2021-10-10_02-12-17702×164 19.1 KB

If I manually add
<script src="https://unpkg.com/@fullcalendar/timegrid@4.4.2/main.min.js"></script> to the document head then the issue is resolved.
Even with this however the design view in Wappler no longer shows my calendar.