I've also tried it with Chrome (Brave is just an enhanced version of chrome FYI) but it worked the same. Do you have any proof with your argument?
https://www.isumsoft.com/internet/how-to-see-saved-passwords-in-chrome.html
Probably because you just had unlocked your computer, so it didn't ask for any, or you have something switched off. Using the browser's password manager is dumb anyways. It's much better to use 1Password, Lastpass, Dashlane, etc...