Property-level title keyword is silently dropped for OpenAPI 3.1 schemas #11053

Q&A (please complete the following information)

• OS: All
• Browser: All
• Version: editor.swagger.io
• Method of installation: None
• Swagger-UI version: editor.swagger.io
• Swagger/OpenAPI version: OpenAPI 3.0/3.1

Example Swagger/OpenAPI definition:

openapi: 3.1.0
info:
  title: Repro
  version: "1.0"
paths:
  /example:
    post:
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              title: Example
              properties:
                plainField:
                  type: integer
                  format: int32
                  title: Only renders on OAS 3.0
                  description: Renders always.
                titledField:
                  type: integer
                  format: int32
                  title: Only renders on OAS 3.0
                  description: Renders always.
              required:
                - plainField
                - titledField
      responses:
        '200':
          description: OK

Describe the bug you're encountering

When a property inside an object schema has its own title keyword set, Swagger UI never renders it anywhere when the document is OpenAPI 3.1. The exact same schema, served as OpenAPI 3.0, renders the titles correctly.

To reproduce...

Steps to reproduce the behavior:

1. Go to 'editor.swagger.io'
2. Paste the example schema
3. Compare title rendering (and lack thereof) between OAS 3.0 and 3.1

Expected behavior

A property's own title keyword should be displayed somewhere (as it is in the OAS 3.0).

Additional context or thoughts

This is distinct from the known $ref-sibling-keyword rendering (e.g., #9540) that changed in 3.1 due to stricter JSON schema adherence. There are zero $refs in the example, as the issue is entirely with property title rendering and has nothing to do with dereferencing.