I had a similar problem, and I couldn’t find a solution, I had reset my PC due to a problem but kept the windows.old so when I made a fresh Brave install and copied the Default folder to my surprise everything worked besides the passwords, I tried everything in this post but it didn’t work, so my last attempt was to go to Settings > Reset Settings and clear it, I then went to copy the password files again and this time I went to User Data copied the old ‘Local State’ and made a backup of this new one and replaced the new Local State with the old one, I started Brave again and voila the passwords showed up.
I made an account to reply here for anyone who may still have this problem.
In conclusion replace the new Local State in User Data with the old one and copy the password files to the new User Data/Default folder.
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