There are other programs that can store your passwords plus always have a paper backup.
How to export passwords/bookmarks
https://community.brave.com/t/how-to-export-passwords-bookmarks/41535
Import Password
https://community.brave.com/t/import-password/73876
10 Best Free Password Manager Software (2020) For Windows 10
https://fossbytes.com/best-free-password-manager-software/
Next to the Start button use the search field and type: control panel
Click on the result. Go to: Credential manager.
Microsoft stores passwords there. If you see some for websites you are saving passwords for then it is not the Brave web browser causing the issue. I would think any updates would leave stored passwords alone there as my work pc has updates each month and none are wiped.
I use Chrome at work and they store passwords and are unaffected.
See #50 for links to how to’s for Brave.