Compaction does not compact "vaccine" and "recipient" keys

[TimoGlastra]

When compacting a JSON-LD document using this context, the credentialSubject.vaccine and credentialSubject.recipient are expanded. nextVaccinationDate is defined in a similar manner in the context, but does use the short form property name.

Is this intended?

Playground link: https://tinyurl.com/33xxeesz

{
  "@context": [
    "https://www.w3.org/2018/credentials/v1",
    "https://w3id.org/security/bbs/v1",
    "https://w3id.org/vaccination/v1"
  ],
  "id": "urn:uvci:af5vshde843jf831j128fj",
  "type": [
    "VerifiableCredential",
    "VaccinationCertificate"
  ],
  "description": "COVID-19 Vaccination Certificate",
  "name": "COVID-19 Vaccination Certificate",
  "credentialSubject": {
    "type": "VaccinationEvent",
    "https://w3id.org/vaccination#VaccineEventVaccine": {
      "type": "Vaccine",
      "atcCode": "J07BX03",
      "disease": "COVID-19",
      "marketingAuthorizationHolder": "Moderna Biotech",
      "medicinalProductName": "COVID-19 Vaccine Moderna"
    },
    "administeringCentre": "MoH",
    "batchNumber": "1183738569",
    "countryOfVaccination": "NZ",
    "healthProfessional": "MoH",
    "nextVaccinationDate": "1958-07-17",
    "https://w3id.org/vaccination#recipient": {
      "type": "VaccineRecipient",
      "birthDate": "1958-07-17",
      "familyName": "SMITH",
      "gender": "Male",
      "givenName": "JOHN"
    }
  },
  "expirationDate": "2029-12-03T12:19:52Z",
  "issuanceDate": "2019-12-03T12:19:52Z",
  "issuer": "replace_me"
}