Failure to access Google Calendar

Tasker seems to be having some trouble accessing some of calendars on my Google account (but not all of them).

As demonstrated in the attached screencast, the same event, moved from one calendar to a new one I created to test the issue, is either seen or not by the calendar state condition in tasker.

At first I believed it to be caused by the accent in the calendar name ("CongésVieux" in the screencast), but the new calendar created for the test also include the same accent ("Congés").

The problem also appears with events in the Google local holidays calendar for France (which, by the way, also include a accentuated letter in it's name).

This used to work flawlessly with the calendars having the issue now. I'm not sure when the problem appeared.