Validation does not start with recursive schemas since version 1.33.0

[TorstenEhrhardt]

I have a recursive schema, where the schema is used within the schema like

Human:
  type: object
    properties:
      ....
      children:
        description: Childred
        type: array
        items:
          $ref: '#/components/schemas/Human'

Until version 1.32.4 this works fine, but starting with 1.33.0 the validation does not start anymore:

[ERROR] There was a problem with spectral.
[ERROR] Error running Nimma
[ERROR] Additional error details:
[ERROR] Cause: no such schema #/components/schemas/Human located in </undefined>
[ERROR] At: Validator.resolve (/usr/local/lib/node_modules/ibm-openapi-validator/node_modules/jsonschema/lib/validator.js:271:11)