Repeated $ref - entry in "allOf"

[faatz-lamapoll]

Current behavior

When "extending" a schema (using allOf) and adding required property, the generated schema will contain two $ref - entries to the referenced schema:

use OpenApi\Attributes as OA;

#[OA\Schema(
  schema: 'abstract-user',
  properties: [
    new OA\Property(
      property: 'name',
      type: 'string'
    ),
    new OA\Property(
      property: 'email',
      type: 'string'
    ),
  ]
)]
class AbstractUser {}

#[OA\Schema(
  schema: 'create-user',
  allOf: [
    new OA\Schema(
      ref: '#/components/schemas/abstract-user'
    ),
    new OA\Schema(
      required: ['name', 'email']
    ),
  ]
)]
class CreateUser {}

Will generate following entries in the schema:

...
components:
  schemas:
    ...
    abstract-user: ...
    create-user:
      allOf:
        - $ref: "#/components/schemas/abstract-user"
        - required:
          - name
          - email
        - $ref: "#/components/schemas/abstract-user"

Expected behavior

The schema should contain only one reference to the extended schema, like

...
components:
  schemas:
    ...
    abstract-user: ...
    create-user:
      allOf:
        - $ref: "#/components/schemas/abstract-user"
        - required:
          - name
          - email

Effects

I only use swagger-ui which does not complain about it, but it confuses when exploring the schemas.
I am not sure if more advanced tools will break with it.