This is still not fixed? This issue has been going for a year and still no updates
Can you please then remove sync if it's not working at all?

Same problem here,

Installed Opera on new laptop, tried to sync and it didn't work.
Went to https://sync.opera.com/web/ and I see all the folders are duplicated but most duplicate folders are empty.
The original folders contain bookmarks but I cannot sync them nor import them.
I don't see any bookmarks on opera:bookmarks page nor do I have "Other speed dials" folder. I have been trying to get my bookmarks all day but no success.