Missing EventSequence names in the JSON profile

"event_sequences": [{
        "offset": 0,
        "events": [{
                        "label": "Metadata of all 0 tables cached",
                        "timestamp": 13596041
                }, {
                        "label": "Analysis finished",
                        "timestamp": 84345355
                }, {
                        "label": "Authorization finished (noop)",
                        "timestamp": 84499136
                }, {
                        "label": "Value transfer graph computed",
                        "timestamp": 105314431
                }, {
                        "label": "Single node plan created",
                        "timestamp": 110919848
                }, {
                        "label": "Distributed plan created",
                        "timestamp": 115423306
                }, {
                        "label": "Planning finished",
                        "timestamp": 187260424
                }]
}, {
        "offset": 0,
        "events": [{
                        "label": "Query submitted",
                        "timestamp": 125578
                }, {
                        "label": "Planning finished",
                        "timestamp": 197022887
                }, {
                        "label": "Submit for admission",
                        "timestamp": 197377109
                }, {
                        "label": "Completed admission",
                        "timestamp": 197591734
                }, {
                        "label": "Ready to start on 1 backends",
                        "timestamp": 197690271
                }, {
                        "label": "All 1 execution backends (1 fragment instances) started",
                        "timestamp": 207852394
                }, {
                        "label": "Rows available",
                        "timestamp": 209102814
                }, {
                        "label": "First row fetched",
                        "timestamp": 300799735
                }, {
                        "label": "Last row fetched",
                        "timestamp": 300879566
                }, {
                        "label": "Released admission control resources",
                        "timestamp": 302725368
                }, {
                        "label": "Unregister query",
                        "timestamp": 306153314
                }]
}],

void RuntimeProfile::ToJsonSubclass(
    Verbosity verbosity, Value* parent, Document* d) const {
  Document::AllocatorType& allocator = d->GetAllocator();
  // 1. Events
  {
    lock_guard<SpinLock> l(event_sequence_lock_);
    if (!event_sequence_map_.empty()) {
      Value event_sequences_json(kArrayType); // <-- We explicitly use array here
      for (EventSequenceMap::const_iterator it = event_sequence_map_.begin();
           it != event_sequence_map_.end(); ++it) {
        Value event_sequence_json(kObjectType);
        it->second->ToJson(verbosity, *d, &event_sequence_json);
        event_sequences_json.PushBack(event_sequence_json, allocator); // <-- 'it->first' is not used. It's the name of the EventSequence.
      }
      parent->AddMember("event_sequences", event_sequences_json, allocator);
    }
  }