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Use the @torproject Tor Browser to access .onion sites, not Brave.
https://www.torproject.org/
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RT @albinowax
I just confirmed that yes, @brave browser's Tor mode appears to leak all the .onion addresses you visit to your DNS provider
https://www.reddit.com/r/netsec/comments/lndfms/more_in_comments_brave_browser_leaks_your_tor/
https://twitter.com/albinowax/status/1362737949872431108
If the @brave was used to open an .onion service - especially if it is self-hosted - it needs to be renewed ASAP.
TorV3 addresses are unguessable unless publicly shared.
If the public and private keys are deleted they will be recreated on Tor restart resulting in a new address.