loginRedirect query param is lost when entering an invalid password

[cxcorp]

1. Redirect to user service login /?serviceIdentifier=....&loginRedirect=http://example.com/foobar
2. Notice that your query still has loginRedirect
3. Enter invalid credentials
4. Notice that loginRedirect has disappeared from the query param

Probably whatever handler returns the "password was wrong" thing forgets to include the loginRedirect in its query params, probably LoginController