Pattern properties do not load external $refs

[tfedor]

Describe the bug
Pattern properties do not load external $refs, it seems to work if the $refs are local, but I didn't properly test it

Expected behavior
$refs should properly load external files

Minimal reproducible OpenAPI snippet(if possible)
test.yaml

openapi: 3.1.0
info:
  title: "Example"
  version: "1.0"
  description: "Example"
paths:
  "/test/":
    get:
      summary: Example
      responses:
        200:
          description: List of shops and their details
          content:
            "application/json":
              schema:
                type: object
                properties:
                  "working":
                    $ref: "testobj.yaml"
                patternProperties:
                  "not-working":
                    $ref: "testobj.yaml"

testobj.yaml

type: object
properties:
  key:
    type: number

Screenshots

[uncaught]

Just ran into this myself. All other $ref's are properly bundled, but every $ref inside patternProperties is not resolved and left as is, leading to an any type.

[lornajane]

Thanks for the issue and explanation @tfedor. I had a quick look at it and it's not clear to me what's technically correct here. OpenAPI supports $refs in quite specific limited locations, but JSON Schema would probably think this was valid, and Redoc will typically attempt to resolve whatever you give it. Moving the references into the same file produces what I think you were expecting (example attached).
openapi.yaml.txt

[uncaught]

I couldn't find any documentation that would suggest that $refs are limited in any way and thus not work in patternProperties.

According to json-schema.org:

A schema can reference another schema

There is no exclusion of a specific location mentioned here nor anywhere. So I would assume they mean any schema. And patternProeprties contains a schema. Thus it should work here, too.