How did all my passwords in Brave's password manager just disappear?

I suspect that I was hacked because shortly before I noticed that my passwords were missing, my antivirus software (Avast) detected a trojan but I’m not sure:

Could this have been caused by a bug, a freak accident, a glitch, etc.?

Is there a way to recover these passwords if I didn’t have a sync chain nor did I export the passwords?

Duplicate of I think my PC was hacked. After my antivirus detected a trojan, all saved passwords were erased from Brave's password manager. Is there a way I can recover the passwords?