swagger-ui File browser shows in Swagger Editor but not in Swagger UI

Q&A (please complete the following information)

OS: Linux or MacOS
Browser: Chrome, Firefox
Version: 90.0, 88.0
Method of installation: dist assets, docker, tried out at https://validator.swagger.io
Swagger-UI version: 3.48.0
Swagger/OpenAPI version: OpenAPI 3.0.1

Content & configuration

Example Swagger/OpenAPI definition:

openapi: 3.0.1
info:
  title: Product Services
  version: 2.3.0
servers:
  - url: /dp/api
tags:
  - name: Image
    description: Operations on Images
  - name: OtherProduct
    description: Operations on \'Other\' Product type data
paths:
  /stage:
    post:
      tags:
        - OtherProduct
        - Image
      summary: Stage content for up to 30 while user completes form.
      operationId: stageContent
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
              required:
                - content
              properties:
                content:
                  type: string
                  description: content (source image or \'Other\' file)
                  format: binary
        required: true
      responses:
        200:
          description: Content staged
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StagedContent'
        500:
          description: Unexpected error
          content: { }
      security:
        - jwt: [ ]

components:
  schemas:
    StagedContent:
      required:
        - id
      type: object
      properties:
        id:
          type: string
          description: staged content id

  securitySchemes:
    jwt:
      type: "http"
      scheme: "bearer"
      bearerFormat: "JWT"

Describe the bug you're encountering

The /stage POST service described in the YAML above takes a file. When I view the UI for the service rendered by the Swagger editor at https://editor.swagger.io (swagger-editor-bundle.js, swagger-editor-standalone-preset.js), a file picker is shown.
When I view the UI for the service rendered by the Swagger UI (swagger-ui-bundle.js, swagger-ui-standalone-preset.js), a textbox is shown. I've tried installing the Swagger UI dist files locally, running the swaggerapi/swagger-ui Docker image, and using https://validator.swagger.io. Results are the same for all three.

It appears to me from this stack overflow question that the behavior was fixed in Swagger Editor in 2018, but that fix wasn't made in Swagger UI. I also realize that this could be related to issue 5636, but am not completely sure.

To reproduce...

Steps to reproduce the behavior:

Render the YAML above in the Swagger UI
Expand the POST stage/ service. See that a text box is shown rather than a file picker.
Render the YAML above in the Swagger Editor at https://editor.swagger.io
Expand the POST stage/ service. See that a file picker is shown, which is what should be shown.