Forwarding to Urls that are secured by Spring Method Security

Question

I've read in the following posts ...

• Spring Security Allows Unauthorized User Access to Restricted URL from a Forward
• Answer to "Spring security “forward:” directive can't forward to login form"
• I’m forwarding a request to another URL using the RequestDispatcher, but my security constraints aren’t being applied.
• Class FilterSecurityInterceptor
• Specifying Filter Mappings

... that in the case of forwarding to a Spring secured Url it's necessary to define the following (in order that the Url is restricted for this special case):

• Define for springSecurityFilterChain not only DispatcherType.REQUEST but also DispatcherType.FORWARD
• Define once-per-request = false
  

My question:
Is this only necessary for Security Namespace Configuration or also for Method Security?

I'm asking this, because in the moment my Spring MVC Controllers are secured by Method Security (@PreAuthorize for methods with @RequestMapping) and I've not added these additional configurations. Nevertheless when I try it out, access for forwarded unauthorized users is restricted for these methods and the login page is displayed.

Some additional information:
I'm registering springSecurityFilterChain via the following classes:

public class MySecurityWebApplicationInitializer extends AbstractSecurityWebApplicationInitializer {
}

and

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class MySecurityConfig extends WebSecurityConfigurerAdapter {
    ... do some configurations ...
}

I'm using Apache Tomcat Version 7.0.56.