Hi Linh,
Yes, the latest Bitwarden app now requires Class 3 biometrics. A previous version of the app allowed Class 2 and higher. (more info)
The short story on why is that with the migration from MAUI to a native codebase, we are dealing with different vulnerabilities. We identified an exploit of Class 2 biometrics that would allow an attacker to bypass biometric unlock. The result, unfortunately, is that now some biometric unlock methods that used to work will no longer work.