Latest Redoc doesn't generate XML request bodies

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I'm attempting to use redoc to generate documentation for an API that takes both XML and JSON requests, but it appears that redoc isn't able to generate samples for the requestBodies of type application/xml.

Here is a minimal YAML file:

openapi: "3.0.0"
servers:
  - url: //0.0.0.0
    description: Dummy Server

info:
  version: 0.0.1

# Tags -- grouping of endpoints
tags:
  - name: vertex
    description: |
      Endpoints associated with vertex operations

# The Paths / Endpoints
paths:
  # Vertex endpoints
  /nuos/add_vertex:
    post:
      operationId: add_vertex
      tags:
        - vertex
      summary: Adds the vertex to the graph
      requestBody:
        $ref: '#/components/requestBodies/VertexIn'
      responses:
        200:
          description: Returns success if it was successful
      x-code-samples:
        - lang: shell
          source: "curl -X post 0.0.0.0:1024/nuos/add_vertex -d @nuos-add-vertex.json"
#definitions
components:
  schemas:
    # Vertex Schemas
    VertexIn:
      type: object
      required:
        - id
      properties:
        id:
          description: The GUID for the vertex
          type: string
          example: "0653e070-9e26-46a2-9833-acb0145e5587"
      xml:
        name: vertex
  requestBodies:
    # Vertex RequestBodies
    VertexIn:
      content:
        application/json:
          schema:
            allOf:
              - description: The vertex to read in
                title: Vertex
              - $ref: '#/components/schemas/VertexIn'
        application/xml:
          schema:
            allOf:
              - description: The vertex to read in
                title: Vertex
              - $ref: '#/components/schemas/VertexIn'
      description: The vertex to add to the graph
      required: true

and using

<!DOCTYPE html>
<html>
    <head>
	<title>Forge.AI Internal Knowledge Graph ReDoc</title>
	<!-- needed for adaptive design -->
	<meta charset="utf-8"/>
	<meta name="viewport" content="width=device-width, initial-scale=1">

	<!--
	     ReDoc doesn't change outer page styles
	   -->
	<style>
	 body {
             margin: 0;
             padding: 0;
	 }
	</style>
    </head>
    <body>
	<redoc spec-url='./spec_minimal.yaml'></redoc>
	<script src="https://cdn.jsdelivr.net/npm/redoc@next/bundles/redoc.standalone.js"> </script>
    </body>
</html>

I get the following output:
screen shot 2018-05-15 at 1 50 16 pm

By contrast, when I use the same YAML file in the editor at https://editor.swagger.io, I get the output that I'd expect:
screen shot 2018-05-15 at 1 50 41 pm

Is there a way to get redoc to generate the desired XML requestBody samples?

Start by loading the provided spec_minimal.yaml with the Redoc standalone bundle and reproduce the requestBody rendering for application/json and application/xml. Trace how the VertexIn request body is converted into samples, then verify that the rendered documentation includes an XML sample alongside the JSON sample.

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