#1396 BYTEPOS and day 30 errors

[Allan Keith Williams]

I get warning errors on a few very old appointments that I cant even find in my calendars now:

Day of month 30 is invalid for Great Lakes Rates - $482.25 - 11/30/2014 9:00:00 AM Recurrence
2024-03-27 13:29:56 | Warning | Synchronizing Google appointment Cull the books at the hall - 1/2/2017 10:00:00 AM Recurrence, such recurrence is not possible at Outlook. Only 'BYSETPOS=-1' is allowed by Outlook, but it was: 1 (see full parsed string: BYSETPOS=1)
2024-03-27 13:29:56 | Warning | Synchronizing Google appointment Sustainability - 7/21/2020 2:00:00 PM Recurrence, such recurrence is not possible at Outlook. Only 'BYSETPOS=-1' is allowed by Outlook, but it was: 3 (see full parsed string: BYSETPOS=3)

My sync settings are 1 month past and 12 months future yet these errors are from up to 9 years ago.
How can I get rid of them?
NB: I've been using GCSM for many years

[Florian Saller]

Please change the recurrence pattern, it seems not to be compliant with Outlook options