<Vaadin LoginForm Failure Handler Breaks login?err...

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Vaadin LoginForm Failure Handler Breaks login?error URL
I'm using the Vaadin LoginForm with Spring Security in a Spring Boot project. By default it redirects to /login?error if authentication fails for any reason. I want to redirect for certain failures, specifically if the user hasn't validated their email yet. I'm trying to use the failureHandler feature to do this, but as soon as I create one, the /login?error URL suddenly requires the user to be authenticated, while /login functions as normal.
My login view:
@PageTitle("Login")
@Route("login",...