WebFilterChain statusCode always wrong?

Question

I'm trying to add a WebFilter that reads and logs the status code of any response.

Problem: if it comes to a WebExchangeBindException like as follows, that status code is always HTTP 200 OK. But why?

@Component
public class ReactiveLoggingFilter implements WebFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        return chain.doOnTerminate(() -> {
                        System.out.println(exchange.getResponse().getRawStatusCode());
                        System.out.println(exchange.getResponse().getStatusCode());
                    });
    }
}

@RestController
public class ExampleServlet {
    @GetMapping("/example")
    public Mono<String> example(@Valid Example exmaple) {
        return Mono.just("OK");
    }
}


public class Example {
    @NotBlank
    private String name;
    
    //getter, setter
}

Interesting: when using the @Deprecated method, I get the correct statuscode:

.doAfterSuccessOrError((e, t) -> {
    System.out.println(exchange.getResponse().getStatusCode());
})