Zod: allOf doesn't work with type string

[schrosis]

When type: string is used with allOf, allOf is ignored.

orval: 7.11.2
zod: 4.1.5

openapi: 3.1.0
info:
  title: example
  version: 0.0.1
paths:
  /example:
    post:
      requestBody:
        content:
          application/json:
            schema:
              type: string
              allOf:
                - $ref: '#/components/schemas/foo'
      responses:
        '204':
          description: No content
components:
  schemas:
    foo:
      type: string
      minLength: 1
      maxLength: 100
      description: 'Foo'

The output zod is this:

export const postExampleBody = zod.string()

allOf is ignored, and min, max, describe, and others are not generated.