patternProperties are not shown for nested objects with no other properties defined

[arvidfm]

Describe the bug
If you have a nested object with patternProperties defined, but no properties, the patternProperties definition is not shown.

Expected behavior
The patternProperties should show regardless of whether other properties have been defined on the same object.

Minimal reproducible OpenAPI snippet(if possible)
If you uncomment the definition of the hello property in the following, both hello and the patternProperties definition show as expected:

openapi: 3.1.0
info:
  version: 1.0.0
  title: Example.com
servers:
  - url: 'https://{tenant}/api/v1'
paths:
  '/users/{username}':
    get:
      summary: Get user by user name
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                properties:
                  test:
                    type: object
                    #properties:
                    #  hello:
                    #    type: integer
                    patternProperties:
                      .*:
                        type: integer

Screenshots
patternProperties not shown:

Additional context
Add any other context about the problem here.