Thunderbird Occasionally Generates a Duplicate of Calendar Event

[NigelTopham]

Your environment Windows 10, hotmail.com

TbSync version: 12.0.2
Thunderbird version: 102.6.1

Expected behavior

Creation of a single new event

Actual behavior

Some time after the event was created a duplicate of the event appeared in the Thunderbird Calendar. My email server is hotmail.com and the duplicate is not created in the hotmail calendar, it only appears in Thunderbird. This happens about 10% of the time that I create new calendar events. I can see no pattern to it. I am using Windows 10. When this happens TbSync reports a synchronisation error. Fault details are posted in Bugzilla as bug 1808696 (https://bugzilla.mozilla.org/show_bug.cgi?id=1808696), including the Event Log. How do I find your email address to email it to you?

Steps to reproduce

Happens for about 10% of new events.

To help resolving your issue, enable debug logging (TbSync Account Manager -> Help) and send me the debug.log via e-mail (use the title of your issue as subject of the email).

[NigelTopham]

Event Log - the duplicated event was "9h Car Repair".

Request:

869690299 3 8a9cbaa9-a15d-430a-9fc9-defba7e1423d AAAAAEcATQBUACAAUwB0AGEAbgBkAGEAcgBkACAAVABpAG0AZQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAoAAAAFAAEAAAAAAAAAAAAAAEcATQBUACAAUwB0AGEAbgBkAGEAcgBkACAAVABpAG0AZQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAAAFAAAAAAAAAAAAxP%2F%2F%2Fw%3D%3D 0 1 0 2 20230104T114329Z 20230104T100000Z 1440 0 9h%20Car%20Repair 20230104T090000Z 8a9cbaa9-a15d-430a-9fc9-defba7e1423d 1

Response:

1594067671 3 1 8a9cbaa9-a15d-430a-9fc9-defba7e1423d 8

Element:
BEGIN:VCALENDAR
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20230103T112020Z
LAST-MODIFIED:20230104T114329Z
DTSTAMP:20230104T114329Z
UID:8a9cbaa9-a15d-430a-9fc9-defba7e1423d
SUMMARY:9h Car Repair
X-MOZ-LASTACK:20230104T114329Z
DTSTART;TZID=Europe/London:20230104T090000
DTEND;TZID=Europe/London:20230104T100000
TRANSP:OPAQUE
X-MOZ-SNOOZE-TIME:20230105T114329Z
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-P1D
DESCRIPTION:Default Mozilla Description
END:VALARM
END:VEVENT
END:VCALENDAR