Beyond me, sorry. I have never used that program and do not know what is normal or what the options are. Hopefully CerealLover can provide more information.
Per the post, this probably applies. I do not know if there are other things you can try.
Do you see your passwords? If not, file may be corrupt.
You could just follow the second set of instructions and import. Not sure if you would at least get the sites/usernames saved in brave://settings/password and can then fill in the password field as you access each site. May be useful (or not). 