[v2.0] Unexpected Failure on OpenAPI 3 Request Validation

I see the below stack trace when POSTing a CreateOpportunityCommand to /opportunities. I've included the relevant part of the spec. I cannot understand why this would fail...

Stack Trace

com.atlassian.oai.validator.restassured.SwaggerValidationFilter$SwaggerValidationException: Validation failed.
[ERROR] Object instance has properties which are not allowed by the schema: ["commandType","opportunity"]
[ERROR] Instance failed to match all required schemas (matched only 1 out of 2)
    * /components/schemas/CreateOpportunityCommand/allOf/0: Object instance has properties which are not allowed by the schema: ["opportunity"]
[ERROR] An error occurred during schema validation - com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException.

Spec

openapi: 3.0.1
paths:
  /opportunities:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateOpportunityCommand'
        required: true
      responses:
        201:
          description: The events triggered by the request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CommandProcessingResponse'
        400:
          description: The errors caused by a bad command
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CommandProcessingResponse'
        500:
          description: The errors caused by issues on the server
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CommandProcessingResponse'
components:
  schemas:
    Command:
      type: object
      required:
      - commandType
      properties:
        commandType:
          $ref: '#/components/schemas/CommandType'
    CommandType:
      type: string
      enum:
        - CreateOpportunityCommand
        - WinOpportunityCommand
    CreateOpportunityCommand:
      allOf:
      - $ref: '#/components/schemas/Command'
      - required:
        - opportunity
        properties:
          opportunity:
            $ref: '#/components/schemas/Opportunity'

Request body

{
    "commandType": "CreateOpportunityCommand",
    "opportunity": {
        "name": "super cool project",
        "type": "residency",
        "customerName": "acme"
    }
}

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