enum values not displayed in example/model view (resubmitted using template)

ENUM values in the schema definition are not displayed in the example/model view sections of the swagger-ui page.

Demonstration API definition

accessTokenReq:
    type: object
    properties:
      grant_type:
        enum:
          - client_credentials
      client_id:
        type: string
      client_secret:
        type: string

Expected Behavior

Rendered by UI:

Example section:

{
  "grant_type": "client_credentials",
  "client_id": "string",
  "client_secret": "string"
}

Model section

accessTokenReq { 
  grant_type  = ['client_credentials'],
  client_id | string
  client_secret | string
}

Current Behavior

Rendered by UI:

Example section:

{
  "client_id": "string",
  "client_secret": "string"
}

Model section

accessTokenReq {
  grant_type {
  }
  client_id | string
  client_secret | string
}

Possible Solution

Context

Start by loading the demonstrated Swagger 2.0 schema in Swagger UI 3.3.1 and reproducing the missing enum in the example and model sections. Trace the example/model rendering paths for the grant_type property, then verify that both sections display client_credentials as shown in the expected behavior.