Can't disable 'show on startup" profile picker

Description of the issue:
see screen recording
How can this issue be reproduced?
see screen recording (link above).
Expected result:
for ‘show on startup’ box to remain unchecked after relaunching brave
Brave Version( check About Brave):

Additional Information: macOS 15.0 (24A335) [latest as of writing], even happens after factory restoring mac (which i had to do for other reasons). at a loss here. any help is much appreciated!