When a page node is used in an authentication tree, e.g. to hold username and password collectors - the behaviour following unsuccessful authentication is quite inconsistent.
See example use-cases:
- Entering a username and leaving password blank - no error message.
- Entering a username and leaving password blank, and then afterwards entering the wrong password - Redirected to the failed login page.
- Entering a username and then the wrong password - Login failure error displayed.
It may be more consistent to see "Login failure" or "Authentication failed" for all three scenarios.