Description of the issue:
All my Brave browsers, including Windows and Android have had their sync’d bookmarks either deleted or duplicated since I upgraded yesterday. On one machine Brave just kept closing down every 20-30 seconds but all the others have been fine - removing just that machine from the sync group made no difference except to stop the crashing. The only thing that has resolved the problem is to kill my sync group on all machines entirely and manually re-import my bookmarks from a backup.
I’d add more to this ticket for support, but I can’t really think what else I can provide considering my only fix it is to disable the problem or risk re-doing it all again.