allOf refer to multiple oneOf, only one oneOf is kept

Describe the bug
When the items under the allOf are $ref to oneOf, only one of the oneOf is left in the merge result.

Expected behavior
In below example, the HTML output should includes two selectors, each one corresponding to an oneOf. And the properties list should have two properties.

Minimal reproducible OpenAPI snippet(if possible)

components:
  schemas:
    IdOrName:
        oneOf:
          - title: By ID
            properties:
              id:
                type: string
          - title: By Name
            properties:
              name:
                type: string
    AgeOrBirth:
        oneOf:
          - title: By Age
            properties:
              age:
                type: number
          - title: By Birth
            properties:
              birth:
                type: number
    DataA:
      allOf:
        - $ref: "#/components/schemas/IdOrName"
        - $ref: "#/components/schemas/AgeOrBirth"

Screenshots