Stackoverflow Error with cyclic reference and adding new property

[RichardSieg]

Hi there!

When we have a cyclic reference and one of the properties gets renamed, the tool throws a Stackoverflow Error.

Here is a minimal working example. The only thing that differs between those two is the new property propname2 in B.

Old yaml

openapi: 3.0.1
info:
  title: recursive test
  version: "1.0"
servers:
  - url: "http://localhost:8000/"
paths:
  /ping:
    get:
      operationId: ping
      responses:
        "200":
          description: OK
          content:
            text/plain:
              schema:
                $ref: "#/components/schemas/A"
components:
  schemas:
    A:
      type: object
      properties:
        propname:
          $ref: "#/components/schemas/B"
    B:
      type: object
      properties:
        propname:
          $ref: "#/components/schemas/A"

New yaml

openapi: 3.0.1
info:
  title: recursive test
  version: "1.0"
servers:
  - url: "http://localhost:8000/"
paths:
  /ping:
    get:
      operationId: ping
      responses:
        "200":
          description: OK
          content:
            text/plain:
              schema:
                $ref: "#/components/schemas/A"
components:
  schemas:
    A:
      type: object
      properties:
        propname2:
          $ref: "#/components/schemas/B"
    B:
      type: object
      properties:
        propname2:
          $ref: "#/components/schemas/A"

Beginning of the output:

==========================================================================
==                            API CHANGE LOG                            ==
==========================================================================
                              recursive test                              
--------------------------------------------------------------------------
--                            What's Changed                            --
--------------------------------------------------------------------------
- GET    /ping
  Return Type:
    - Changed 200 OK
      Media types:
        - Changed text/plain
          Schema: Broken compatibility
          Missing property: propname (object)
--------------------------------------------------------------------------
--                                Result                                --
--------------------------------------------------------------------------
                 API changes broke backward compatibility                 
--------------------------------------------------------------------------

Exception in thread "main" java.lang.StackOverflowError
	at java.util.regex.Pattern$GroupHead.match(Pattern.java:4660)
	at java.util.regex.Pattern$Branch.match(Pattern.java:4606)
	at java.util.regex.Pattern$BmpCharProperty.match(Pattern.java:3800)
	at java.util.regex.Pattern$Start.match(Pattern.java:3463)
	at java.util.regex.Matcher.search(Matcher.java:1248)
	at java.util.regex.Matcher.find(Matcher.java:664)
	at java.util.Formatter.parse(Formatter.java:2549)
	at java.util.Formatter.format(Formatter.java:2501)
	at java.util.Formatter.format(Formatter.java:2455)
	at java.lang.String.format(String.java:2940)