Upon submitting forms for some Australian Government websites Brave simply CTD’s. Reproduced in several attempts, had to switch to Firefox to complete my tasks.
Websites in question:
https://check.aec.gov.au/ -easiest one for others to test with as you can enter any dud information
(also the change address form on the aec website)
They seem to use the same “BotDetect .NET Captcha Control” so this may be the culprit. I cannot provide exact input for reproduction as it contains personal information.