Hello @scamidge
i think the issue not related to brave but to pam setup so to make sure that the issue not related to brave
could you install chrome (or open any app that use the keyring) then use chrome to login to some site then reboot then open chrome and see if you get the same keyring password screen or not
here a solution from the team of manjaro
you well need app called seahorse to work using gui
hope that help and have a nice day 