I just tried to pay for something at sainsburys.co.uk (via a nationwide.co.uk debit card window) and Brave (v1.41.99 on Mac 10.15.7) crashed. There were several tabs open at the time but I assume that it was the sainsburys.co.uk tab because when I tried several times with just that tab open, it crashed every time. I eventually had to pay using another browser (Vivaldi).
I have had a few crashes in the last week or so which may have been linked to form submissions but I cannot be certain.
I can’t troubleshoot much more at the moment because I don’t want to make any more payments but I will try again, probably tomorrow.