multipart body request is empty when using BeforeFilterFunctions rewritePath

[RomainPro76]

Describe the bug
I'm using spring gateway mvc as a simple gateway to route input request to backend app. My route config rewrite the host and the url base path.
It works well except for multipart requests. With a multipart request, the output body is empty.
After some research in my side to identify the problem, it seems the rewritePath function is the root cause. If I delete it of my route, multipart requests works.
I'm using the function rewritePath in org.springframework.cloud.gatexay.server.mvc.BeforeFilterFunctions in a RouterFunction policy.

Sample

To prove the problem, I reproduced the case with this simple code.

@Configuration
public class RouterConfiguration {
    private static final String WILDCARD = "/**";
    private static final String SEGMENT_TO_INCLUDE_REGEX = "(?<segment>.*)";
    private static final String SEGMENT_TO_ADD_REGEX = "${segment}";
    
    @Bean
    public RouterFunctions.Builder routerFunctionsBuilder() {
        return RouterFunctions.route();
    }

    @Bean
    public RouterFunction<ServerResponse> buildRoutes(RouterFunctions.Builder routerFunctionsBuilder) {
        var destinationHost = URI.create("http://localhost:9008/");
        
        routerFunctionsBuilder
                .POST("multipart" + WILDCARD, HandlerFunctions.http(destinationHost)) // multipart works with this line only
                // multipart don't work anymore in adding the filter (body is empty)
                .before(BeforeFilterFunctions.rewritePath("multipart" + SEGMENT_TO_INCLUDE_REGEX, "/api/multipart" + SEGMENT_TO_ADD_REGEX));

        return routerFunctionsBuilder.build();
    }

}

Versions
Spring Boot : 3.3.0
spring cloud starter gateway mvc : 4.1.5

related issues but not solved : 3449

** Expectations **
rewritePath function works with multipart requests