Problem with linting for document with undefined term

[fabianekc]

The following DID Document has undefined terms but passes linting:

Steps to reproduce: https://runkit.com/embed/8xg4vm8d3lj4

var jsonldLint = require("jsonld-lint")
await jsonldLint.lint('{"@context":["https://www.w3.org/ns/did/v1"],"id":"did:xxx:123","verificationMethod":[{"id":"did:xxx:123#key-1","controller":"did:xxx:123","type":"ED25519","publicKeyHex":"b0..."}],"authentication":["did:xxx:123#key-1"],"service":[{"type":"DIDDecrypt","id":"did:xxx:123#resolver","serviceEndpoint":"https://example.com","serverType":0,"protocol":2}],"alsoKnownAs":[{"id":"did:xxx:123","type":101}],"extension":{"attributes":[{"encrypt":1,"format":"text","value":"BID文档","key":"name","desc":"名称"}],"delegateSign":{"signatureValue":"03...","signer":"did:xxx:123#key-1"},"recovery":["did:xxx:123#key-2"],"ttl":86400,"type":102,"verifiableCredentials":[{"id":"did:xxx:123","type":"201"}]},"version":"1.0.0"}')

returns no errors

Using JSON-LD Playground errors are identified: link

expected behaviour: jsonld-lint should also report errors