Hey there Arna,
okay, the logs were empty - so i deleted the account and tried to add it again. At the moment it is not syncing anything 😃
I found, that i've to change the calender setting for every calender of the google account to active and safe that setting. This happened to me the first time, now.
The at the first view this first-time sync looks complete. The Log stayed empty, too.
To your other questions:
The missing events are no recurring ones, no.
locale & date format info.PNG
next time i stumble upon a error of doublications or misssing events, i'll export the google events.
Thanks for your help, hopefully i don't need to write again 😃
Best wishes
Kruzi
edit: 14. march 2022:
found a doublicate and sent it to you via the bug report