I’m facing the same issue. Today I got logged out from all the accounts and my passwords got deleted from password manager. I’m using Linux. Thankfully I got the backup from my mobile phone otherwise I have lost access to many of my accounts. There is one issue also, the passwords are not synced automatically for newer accounts created. I noticed when I visited the website that there was no autocomplete on the password. Fortunately I got access to my email account and could ‘Forget the password’ from the website.
Hope devs solve this issue. Currently the version I’m using is ‘Brave 1.80.125 (Official Build)(64-bit)’.