"Subscribed" (third-party / subscription) Google Calendars are not shown
Using a Google Account synchronization, I see all my Normal Calendars but not my Subscribed Calendars (those, I added using the calendar.google.com web-UI).
When I initially set up gnome-calendar, it showed one of my Subscribed Calendars, but after I deleted this one (in the Web-UI) and added a new one, they are no longer displayed (or listed). Even deleting the Google Account and adding it again did not help.
Using gnome-calendar 3.30.0 on Ubuntu 18.10.