This.
“Just do a quick update” and spend 1h trying to fix some broken updates

Also look at https://archlinux.org/news/ before updating (or follow the RSS feed), some updates may need manual intervention

I use Davx⁵ fôr Webdav/NextCloud calendars sync, and Fossify Callendar

Maybe not what you looking for, but must Foss calendars are based on AOSP calendar, with same look and features

Had the sane issue on Firerox+uBlock the laptop, but on phone is working (Kiwi+uBlock).

Try with other browser, with or without adblocker

https://github.com/Ravencentric/awesome-arr