swagger-ui: Map query parameters are not working as expected.

Given the following definition

  //spring-mvc definition
  @RequestMapping(value = "/category/{id}/map", method = RequestMethod.POST)
  public ResponseEntity<Void> map(@RequestParam Map<String, String> test) {
    return ResponseEntity.ok(null);
  }

   //Jax-rs definition
   @POST
   @Consumes("application/x-www-form-urlencoded")
   public void map(MultivaluedMap<String, String> test) {
     // Store the message
   }

Produces the following spec. The spec is a valid spec for the parameter (test) which is an open ended grab bag of query parameters.

{
   "basePath":"/springfox",
   "host":"localhost:8080",
   "info":{
      "contact":{
         "name":"springfox"
      },
      "description":"",
      "license":{
         "name":"Apache License Version 2.0",
         "url":"https://github.com/springfox/springfox/blob/master/LICENSE"
      },
      "termsOfService":"http://springfox.io",
      "title":"Springfox petstore API",
      "version":"2.0"
   },
   "paths":{
      "/category/{id}/map{?test}":{
         "post":{
            "consumes":[
               "application/json"
            ],
            "operationId":"mapUsingPOST",
            "parameters":[
               {
                  "description":"test",
                  "in":"query",
                  "items":{
                     "additionalProperties":{
                        "type":"string"
                     },
                     "type":"object"
                  },
                  "name":"test",
                  "required":true
               }
            ],
            "produces":[
               "*/*"
            ],
            "responses":{
               "200":{
                  "description":"OK"
               },
            },
            "summary":"map",
            "tags":[
               "category-controller"
            ]
         }
      }
   },
   "swagger":"2.0",
   "tags":[
      {
         "description":"Category Controller",
         "name":"category-controller"
      }
   ]
}

However in swagger-ui, when we load this spec, we see this error

NOTE: This error manifests itself in editor.swagger.io as well.