No bookmarks in existing Safari Tab Group Favorites
I recently upgraded to macOS Sonoma 14.4.1. When I went to use my Safari Tab Groups, all of the bookmarks had been removed, although the titles for the groups were still listed. My tab groups contained quite a lot of useful material and I would like to restore the links. Is there a way to repopulate the tab groups. I am not an iCloud user, but manage my backups locally with Time Machine.
iMac (M1, 2021)