- Edited
It does in fact create duplicates even within the Bookmarks Bar section and the Favorites section, not just between them.
As you can see in the image, the folders are duplicated under Favorites. They were duplicated in exactly the same way under Bookmarks Bar, but I deleted the duplicates already. I still see the duplication on mobile, but perhaps that is showing only Favorites (with the duplication) or both Favorites and Bookmarks Bar, since it doesn't have a separate bookmark bar.
This happened to me before but I ended up somehow with half in Favorites and half in Bookmarks Bar. I just did a removal of all installs on all devices to try to solve it, but it happened again when I imported from Safari on the first device re-install.
Personally, I think it would cause less confusion to not create duplicates in Favorites and in Bookmarks Bar, but to let people know (via a pop-up message the first time Bookmarks is opened or a tour of the app) that all Bookmarks are now in ... wherever you end up putting them. Maybe create an Imported Bookmarks folder and put everything in there and let the user decide where they want to put them.
I am just going to delete the duplicates to fix it and see if that gets synced over to other installs. The syncing issue is what led me to attempt a reinstall everywhere, and that was the problem that I was originally looking for that led me here.