All doc comments target this version of JSON schema, which is deprecated and NOT the one used by OAS3.1
https://datatracker.ietf.org/doc/html/draft-fge-json-schema-validation-00

OAS3.1 currently contains links to this JSON schema spec, but I believe this is wrong https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-00

(asked clarification here OAI/OpenAPI-Specification#4082 (comment))

I believe the links should instead be https://json-schema.org/draft/2020-12/json-schema-validation