Google Calendar sync has been working well for me, but today I tried to make a new recurring event, and it ended up getting duplicated in ClickUp. I tried logging out and logging back in (in ClickUp and in my Google account), but the problem still persisted. Then I tried unsyncing my Google calendar from Click Up and creating a new calendar event to see if that would fix the problem. It did not, and now I have 4 duplicate events occurring every Monday.
This seems to be an issue that has been going on for a while in ClickUp, so I hope it is fixed soon.