Version tested is: 1.19alpha (Version 93922), here the link during login "Forgotten your login details?" points to a form
Reset password: Complete this form to receive an e-mail reminder of your account details. Username: [ ] [e-mail new password].
which is the page: Special:PasswordReset. This page exists WITHOUT Extension:Password Reset being installed. It seems a (different) core functionality uses the same special page name now? Any insights?