Relation fields on different objects not in patch are mutating with PatchSchema (and erroring)

[AndrewSisley]

e.g.

type Contact {
  email: String
  player: [Player] @relation(name: "playerContact")
} 

type Player {
  authId: String
  characterName: String
  email: String
  refCode: String
  contact: Contact @primary @relation(name: "playerContact")
}

http://localhost:9181/api/v0/schema
{"Patch":"[{\"op\":\"add\",\"path\":\"/Player/Fields/-\",\"value\":{\"Name\":\"test1\",\"Kind\":11}}]","SetAsDefaultVersion":true}
Error: mutating an existing field is not supported. ProposedName: contact