Is HTTP Basic Auth Broken in Chromium?

Any time I try to access a page that requires Basic authentication, chromium just renders the server's 401 page instead of opening a dialog to ask for a username/password.

I could not find any existing bug reports about this... am I the only one with this issue?

https://authenticationtest.com/HTTPAuth/

https://testpages.eviltester.com/pages/auth/basic-auth/basic-auth-protected.html