Calendar sync not wokring

Yup, Gadgetbridge has all permissions. It also lists all available calendars under the blacklist selection. And I get the following log entries if I create a new event:

19:09:08.117 [main] INFO  n.f.g.e.CalendarReceiver - event id=419 is yet unknown to device id=1
19:09:08.137 [main] DEBUG n.f.g.s.DeviceCommunicationService - Service startcommand: nodomain.freeyourgadget.gadgetbridge.devices.action.add_calendarevent

But not the UART TX lines you've mentioned.

I'm not sure if this is related, but it's strange that only one of 4 black-listed calendars is mentioned in the logs:

19:09:07.873 [main] INFO  n.f.g.u.c.CalendarManager - Loading calendars_blacklist
19:09:07.873 [main] INFO  n.f.g.u.c.CalendarManager - Loaded calendars_blacklist has 4 entries
19:09:07.899 [main] DEBUG n.f.g.u.c.CalendarManager - calendar ...@gmail.com/Holidays skipped because it's blacklisted
19:09:08.005 [main] DEBUG n.f.g.u.c.CalendarManager - Reminder Method: 1, Minutes: 60

If I remove that calendar from the blacklist, the log correctly states Loaded calendars_blacklist has 3 entries, but there are no "skipped" log lines for the other 3 calendars.