Default /logout does not work if /login is customised spring security 5.7.11

Question

Below is my security config:

public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http){

    http
            .authorizeExchange(authorizeExchangeSpec ->
                authorizeExchangeSpec
                        .pathMatchers("/login").permitAll()
                        .anyExchange().authenticated()
                        .and()
                        .formLogin().disable()
                        .csrf().disable()
                        .oauth2Login())
            .exceptionHandling(exceptionHandlingSpec ->
            exceptionHandlingSpec.authenticationEntryPoint(new RedirectServerAuthenticationEntryPoint("/login")));
    return http.build();

}

I have a customized login page which works fine, and when i access the application, the custom login page is rendered. But, now when I try to logout form the application, using /logout GET call, it does not work. If I remove the custom login page configuration:

exceptionHandling(exceptionHandlingSpec ->
            exceptionHandlingSpec.authenticationEntryPoint(new RedirectServerAuthenticationEntryPoint("/login")))

And then try /logout GET call from the client, it works fine and default spring security behavior is seen for logout, where the call redirects to logout confirmation page and a logout button is displayed.

But after customization, the above default behavior is not working, looking at the logs I can see the spring security expects /logout to be POST call:

DEBUG o.s.s.w.s.u.m.PathPatternParserServerWebExchangeMatcher - Request 'GET /logout' doesn't match 'POST /logout'
27-03-2024 11:34:19.553 [reactor-http-nio-8] DEBUG o.s.s.w.s.u.m.OrServerWebExchangeMatcher - No matches found

This authentication mechanism is implemented into a gateway, and I can't have a post call in gateway application, how do I get the GET /logout (default spring-secuirty) behavior to work.

I tried the configuration as suggested in the spring secuirty doc:OIDC-Logout, but as spring expects POST call, I am unable to get the logout to work, the session is not getting removed in gateway application nor is the RP-Initiated logout working through logoutSuccessHandler