Dangerous "Open a File" button for importing .ics files as "calendars" in the "New Calendar" dialog: the resulting calendar will be deleted when local backing .ics file is deleted

I noticed that my GNOME 3.34 calendar events (imported from http://www.gnome.org/start/unstable/schedule.ics) were no longer being displayed by GNOME Calendar.

Look:

I was quite surprised to find that location there. Problem is I cleared my Downloads directory. Instead of importing the ICS file into a directory owned by GNOME Calendar, Calendar seems to be assuming that I'll never move the file that the calendar was originally created from... not a good assumption.