Validation isn't occurring for external $refs, even after lazy-loading and rendering them.

[ponelat]

Q&A (please complete the following information)

• OS: Linux (NixOS)
• Browser: Chrome
• Version: ?
• Method of installation: Online version, editor.swagger.io
• Swagger-Editor version:

{ 
 swaggerEditor: "4.0.1/gab9f22c-dirty"
 swaggerUi: {version: "4.1.0", gitRevision: "gb71446c", gitDirty: true, buildTimestamp: "Mon, 08 Nov 2021 13:01:36 GMT"}

Example Swagger/OpenAPI definition: https://editor.swagger.io/?url=https://gist.githubusercontent.com/ponelat/7165747e273af0ecb6d4ff7f994eb4ac/raw/3be018fdccb33144bfa2ab4197d0a094a496481f/openapi.yml

Describe the bug you're encountering

After expanding POST /pet, I see "Unknown type: asd", which makes sense but there are no validation errors.

To reproduce...

Steps to reproduce the behavior:

1. Go to https://editor.swagger.io/?url=https://gist.githubusercontent.com/ponelat/7165747e273af0ecb6d4ff7f994eb4ac/raw/3be018fdccb33144bfa2ab4197d0a094a496481f/openapi.yml
2. Expand the POST /pet (the only operation) operation

Expected behavior

Validation errors occur, similar to this one...

Screenshots

No validation errors, but the following is shown.

Additional context or thoughts

Not sure if this is a regression or a feature request