Hi, same issue on Mac Ventura 13.2. Lost all passwords. Couldn't add a new password manually. No more offering to save password. Importing passwords from Chrome didn't work. Synchronising either.
Uninstalled and installed brand new Opera. Synchronising successful- except password. Still the same. All password features just don't work at all. Still no offer to save, cannot add manually. Importing from Chrome didn't work.
Switched to Chrome and all is working there.