Heads up: in-browser editing on NextCloud does not work

On my calendar, I can now no longer see all the Reef’s events that are now linked to one of the four calendars that @Lee has created in Nextcloud. I can see that they are shared with me on Nextcloud, but do I need to do something to connect my Google calendar to all these new ones?

I revisited this post (How to add The Reef's calendar to your own calendar app), but I’m not sure if the section ‘Adding The Reef’s calendar to your calendar app’ applies to adding every newly created calendar, or just Nextcloud in general…