Adding an object to a Set, deleting the parent object, and then deleting the previously mentioned object causes crash

[jsflax]

Crashes with KeyNotFound(util::format("No object with key '%1' in '%2'", k.value, get_owning_table()->get_name())).

Simple repro case (from Swift SDK but I'm sure can be replicated in core):

let realm = try Realm()
let collectionObject = SwiftCollectionSyncObject()
let personObject = SwiftPerson()
try realm.write {
    realm.add(collectionObject)
    realm.add(personObject)
}
try realm.write {
    collectionObject.objectSet.insert(personObject)
}
try realm.write {
    realm.delete(collectionObject)
}
try realm.write {
    realm.delete(personObject)
}